Just had a thought: One common complaint about being a martial character is that unless you have something that gives you Pounce, you can't Full Attack much of the time, because it is a Full-Round Action, and you often have to move first by more than a 5 Foot Step. Well, what if you could Move and then Full Attack by having your Full Attack action span the boundary between rounds?
The revision would be that if you have used a Standard Action in the current round but have your Move Action remaining, you can start a Full-Found Action as your Move Action, and then it will also consume your Standard Action in the next round. Likewise, if you have used a Move Action in the current round, but have a Standard Action remaining, you can start a Full-Round Action as your Standard Action, and then it will also consume your Move Action in the next round.
This will also help spellcasters trying to cast Full-Round Action spells to some extent, but not as much, because they are more likely to just stay where they are (or 5 Foot Step) and start casting right away rather than moving.
From the way I understand the Pathfinder Unchained Revised Action Economy, this could be combined with the above, except that instead of Full-Round Actions spanning a round boundary approximately 50%~50% (actually more like 51%~49% or 49%~51%), they would span a round boundary 1/3~2/3 or 2/3~1/3.
I thought for sure somebody must have thought of this already, but I searched for Fractional Round Action Economy (also tried just the first 2 terms) and didn't find anything relevant.
Edit #1: Just read the Pathfinder Unchained Revised Action Economy again and saw that it looks like by itself it allows round boundary spanning for Full Action spellcasting, but I can't find that it does so for Full Attacks, although maybe I missed some subtlety in how iterative attacks have been replaced -- actually, HOW DO you replace Full Attacks in there? -- the "Attack Actions" section makes it sound like you can actually remove some of your iterative attack penalty by making the equivalent of a Full Attack span a round boundary, but if you would have had 4 iterative attacks under the old rules, you can never get the last one, and what do you do if you have Flurry of Blows or Two/Multi-Weapon Fighting or more than 3 Natural Weapon Attacks?
Edit #2: What I like about what I proposed above (if I may say so myself) is that you don't have to change everything in the Action Economy -- just allow Fractional Rounds and otherwise do everything the same as in pre-Unchained rules.
Just had a thought: One common complaint about being a martial character is that unless you have something that gives you Pounce, you can't Full Attack much of the time, because it is a Full-Round Action, and you often have to move first by more than a 5 Foot Step. Well, what if you could Move and then Full Attack by having your Full Attack action span the boundary between rounds?
The revision would be that if you have used a Standard Action in the current round but have your Move Action remaining, you can start a Full-Found Action as your Move Action, and then it will also consume your Standard Action in the next round. Likewise, if you have used a Move Action in the current round, but have a Standard Action remaining, you can start a Full-Round Action as your Standard Action, and then it will also consume your Move Action in the next round.
This will also help spellcasters trying to cast Full-Round Action spells to some extent, but not as much, because they are more likely to just stay where they are (or 5 Foot Step) and start casting right away rather than moving.
From the way I understand the Pathfinder Unchained Revised Action Economy, this could be combined with the above, except that instead of Full-Round Actions spanning a round boundary approximately 50%~50% (actually more like 51%~49% or 49%~51%), they would span a round boundary 1/3~2/3 or 2/3~1/3.
I thought for sure somebody must have thought of this already, but I searched for Fractional Round Action Economy (also tried just the first 2 terms) and didn't find anything relevant.
Edit: Just read the Pathfinder Unchained Revised Action Economy again and saw that it looks like by itself it allows round boundary spanning for Full Action spellcasting, but I can't find that it does so for Full Attacks, although maybe I missed some subtlety in how iterative attacks...
Flurry of Blows and TWF all act based on the attack actions only divided.
Two Weapon Fighting makes two attacks on the first attack action during the turn. Improved TWF adds an attack to the second attack action in a turn. Greater TWF adds an attack to the third attack action in a turn. Same goes for Flurry of Blows. Attack with all natural weapons is a 3 act action.
I played around with it. Nobody misses the 4th iterative attack because it never hit anyway. Full attack actions are three acts so it would be reasonable to reinsert full attacks that way so you get them all but in the one shots I did doing that nobody really took up on it.
Edit #3: Doing the above would also help with the Melee-Archer Disparity.