Disabling USB hard drives but allowing USB keys mounting, possible ?

Hi all,
I have a tricky request from one of my customers : they would like to block any external hard drives (firewire and USB) from mounting on the Desktop, BUT would like to allow USB keys only.
All the clients are unmanaged (local accounts, NOT bound to an Open Directory Master server) and are running OS X 10.4.8 (Intel).
I found the easy way to prevent any Firewire device to show up.
I also found how to disable all USB devices (except for keyboard/mouse) : renaming /System/Library/Extensions/IOUSBMassStorageClass.kext
Problem is, this method won't make any difference between a hard drive and a key, it will block it, period.
Is there any way to allow some (or all) USB keys only to mount ? My only guess would be to unload some extensions which are listed by the "kextstat" command.
That could only be possible if USB keys and USB hard drives don't use the same kind/brand of controller/bridge and therefore don't use the same kernel extension.
Does anyone have a clue on this ?
Many thanks.
Mac OS X (10.4.8)

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