If anyone does not use a HOTAS (and maybe even if you do) then Roccat Powergrid on a tablet is an amazing addition. I macro'd searching and routing my 2 current trade destinations, I macro'd a docking request, then shortcut keys for landing gear, 100%,75%,50%,0% throttle, hyperspace, supercruise... Everything I need that isn't on the stick.
It's a tactile replacement for Voice Attack, because I don't want to talk to my computer... If I start barking orders at the screen my kids will think I've gone off the deep end.
Other than that, I may have already posted about My MS Sidewinder Precision Pro, but it's one of the great older sturdy sticks, and when you use one button as a sort of 'shift' key, it more or less has enough buttons.