Love that idea, and honestly it would be great if a lot of those old skill feats could get some more juice to make them not entirely rubbish. Got me thinking on what they could do to improve some others and came up with a few ideas:
Acrobat could give +1 tumble charges for when that system comes out.
Alertness could give faster searching speeds and/or greater range on detection.
Athletic could give like 1% dodge or lower armor check penalty something.
Negotiator could get faster cooldowns on linguistic skills.
Self Sufficient could just give some universal amps.
Stealthy could get some sneaking speed bonus.
Admittedly I still doubt I'd take any of those on most characters so maybe they could be tuned higher, but it would be nice to see a lot of old, un-used feats get something to at least give them some chance at having a home.
These are some great ideas, but yeah...I wouldnt want to start overlapping with combat stats like Dodge, I think it'd be better if they focused on stats that werent already widely available, but you could definitely do:
Acrobat: +1 Tumble charge and 20% faster recharge
Athletic: 10% runspeed (and maybe change Barb to autogrant it at L1 instead of unique 10% runspeed, if stacking was an issue)
Self Suff: Reduces the self-heal penalty in Reaper by half (ok maybe that one's a pipe dream lol). Could be "only when soloing" too, which includes hirelings
Combat Casting: -10% ASF
Stealthy: Enemies must succeed twice at Spot or Listen checks to detect you while sneaking (ie Slippery Mind for stealth)