Something like that, yeah. Wizards get an equivalent to extra swift actions in Multispell, but that limits you to only Quickened spells. A feat adding extra swift actions would be helpful to everyone else, if not nearly as much.
Also, adding extra Standard actions as well, but that's something that would need an absurdly high prereq in Dex, level, or both.
On an unrelated note, changes to Deflect Arrows so that a character with Infinite Deflection and Exceptional Deflection so that a character with those feats isn't absolutely immune to ranged attacks would not be amiss, but that's really outside the scope of this thread.