JJJ's page

I really want more material for all classes. How about an 'Advanced' book for each class. Not the length of the current advanced book, maybe 36 pages like some companion books. These book would include updated basic class features along with archetypes, and a break down for making a custom archetype similar to how the advanced races broke down race creation. They could also include a small section of pre-build npc's with a variety of flavors.

Since you don't mind multi-classing try a Gunslinger(Musket Master)5/Luring Cavalier (Musketeer)15. The musketeer levels will qualify you for fighter feats like weapon specialization. Another class to combo with the gunslinger is paladin (no archetype needed).
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Gunslinger feats you need (and need fast):
Lv 1: Rapid Reload (free for the musket master)
Lv 1: Point Blank Shot
Lv 3: Rapid Shot
Lv 4: Deadly Aim (time to do some killing)

After 5 levels of gunslinger the class IMO really doesn't add a lot to itself.

And always use alchemical cartridges. At level 3 you will be able to reload a musket as a free action.