More Jags? We ended up magic smoking a lot this year, for various reasons, but we needed 11 motor controllers on the robot... We always like using jags more than victors, but only had 6 workable jags and 5 FIRST-legal victors (a couple were old versions that are now illegal). Just more motor controllers, even for the vet teams like us...
Also, more PWM cables
would be nice. We bought some supplies to make our own, but they weren't quite right, and weren't as reliable as the pre-crimped ones... Maybe even if you just gave us the right materials to make custom-lengthed PWMs it would be good! Male/female pins, housing, wire- I know lots of teams that just end up buying these anyways to get the right length. I still owe some really nice kid from grapes of wrath a pwm cable.
It's cool that we got a ribbon cable with connectors on either end (for connecting the sidecar and cRIO), but it'd be even better if we got one more like
this - the screws are more secure, and more convenient than putting in your own. I know I'm getting a tad specific here...
Oh yeah! And maybe another battery charger for the vets, and more FIRST stickers. I would always like more wire, connectors, and switches, but this is all kind of wishful thinking

I do like getting this stuff not through FIRST choice though. It makes things a lot easier, and I think they tend to be needed by every team.