My biggest issue w/ my KLR is my hands (especially my right/throttle hand) going to sleep. Beyond the Doohickey, my mods have been:
Renthal 666 bars
Meyer Deluxe Woods Pro hand guards (bars and plastic deflectors)
Pro Grip Gel 714 grips
Pelican 1450 "top case"
and, of course, TKC80s - I think these tires were made for KLRs
I can now go half an hour before my hands fall asleep instead of the five minutes I used to be good for. I'm hoping that carpul tunnel surgery will enable me to never need to deal with this nagging problem again. YMMV.