I had a quick poke around, and I didn't find an administrative template to do this. After I'd thought about this a bit more, since all ofthe admin tools are based on MMC.EXE you actually don't want to disable the start items at all.
It would be better to create a software restriction policy, with a ahash rule for MMC.EXE and apply that to the users on the Terminal servers. Probably best to exlude administrators from this GPO though, otherwise bad things may happen.
Be Warned: I've not attempted this yet, so I've no idea if disabling MMC.EXE will break windows, I shouldn't have thought it would, but you never know..
Hope that helps.
Cheers,
Paul
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Paul Haigh, Reg. 4120
(mk1) 6GB, Blue, 00254
(mk2) 12GB, Red, 00357