the horn is a classic upgrade when your talking steeringwheel controlls..
kidding aside the blinkers are pretty easily accessible as they are imho..
Since you have a manual tranny paddle shifting is not easy or cheap but a possibility
http://www.mastershift.com/p_street_manual.html
https://www.youtube.com/watch?v=zUbi1epN0-c
but you need to move stuff to the steering wheel that you actually have to reach for... shifter, linelock, radio, nitrous, purge, wipers? intercom/radio, shock stifness (ned ridetech shocks)