As for more actions point when someone joins combat late: I don't see why time should run faster for a character just because he is further away from combat. A turn in combat is 6 seconds (I think) and your AP represent what you can do in those 6 seconds not more, not less (sans buffs/debuffs).
I just suggested that as a measure to bring the joining character faster to the action. When the turn-based area is quite big then the joining character would at least need 2 or even 3 turns to even get to his/her partner and to be able to participate in fighting. In the current status of the game many fights are already over after a few turns so it would be a bit tedious and boring for the joining partner to just move forward on the battlefield...
But maybe it can be done without, has to be seen.
