Alright, as a set of house rules a couple of friends and I created a list of feats that don't add much to their prerequisite but are required for later, better forms, of said ability. Seeing this we decided to see what it would be like to collapse them down and just grant heightened versions at appropriate levels, would there be any major issues with:
Reducing TWF/ITWF/GTWF down to just TWF
Reducing PBS and precise into one feat, possibly reducing the benefits of precise to 30'. Point Blank Precision!
reducing mobility and spring attack into one feat, mobility attack!
Not sure about the maneuvers but I'd also be tempted to make improved -> greater.
making weapon finesse, combat expertise, power attack, deadly aim, piranha strike, agile maneuvers, cleave baseline. Mainly due to these being things that you'd think someone could totally do. Though I kind of just want to remove deadly aim, or at least rename it.
Lastly, we were tempted to make weapon focus/specialization and rapid reload apply to weapon groups instead of specific weapons.
This all probably seems quite drastic, but it's tiring to see someone forced to specialize to make a character concept work(TWF especially), and in our campaigns our players aren't necessarily rules-savvy so giving them the feats that are effectively required to be good seemed like a good idea. It's also a hope that maybe with this we can get fighters to branch their feat lists into general/story feats of interest. Or become valid switch-hitters.