I've updated my teeny-tiny mod "APR on Spec" to install on IWD:EE. I don't have the game yet so I cannot test it, and cannot yet see whether I've made any bad assumptions about the presence/absence of various .2da files. So if there seems to be any problem, report them here.
What this does: This simply allows non-warriors to get extra APR bonuses from specializing in weapons. That includes Swashbucklers, and anyone using spell weapons that grant a certain level of proficiency. Warriors behave normally, getting APR bonuses at levels 7 and 13 as well as the usual specialization/grandmastery bonuses.
This works with all mods kits too - it should be installed after any kit mods. (Don't use this with Scales of Balance - it has its own version of this component.)