SSH access, for real. You can make a normal and an expert firmware release. The expert one will include SSH access, and a disclaimer about screwing up your system
Folding@Home daemon. My 1u4500 only uses 8% of the CPU will rebuilding the RAID (4x RAID5) I leave it on 24/7, so I know there are plenty of times when its not being accessed and it could be curing cancer. Make sure we can edit the config file through the browser (to pick our user name and team name).
I think thats it... Im happy with everything else... maybe clean up the web interface.