Allan Odgaard has the lowdown on InputManager support in Leopard:
Contrary to most rumors, input managers still work on Leopard (at least on my pre-GM seed), but for an input manager to be loaded there are now a few requirements it needs to fulfill.
The confusion over this is that during the pre-release seeding this summer, input manager support in Leopard changed quite a bit. For a while, they really didn’t work at all. In the shipping version, they work, but installing them now requires administrator authentication (so the potential problem where they could be installed silently behind your back, as with Smart Crash Reports, is now closed). But they’re officially unsupported, don’t work at all in 64-bit apps, and are “likely to be disabled in a future release”.
★ Tuesday, 30 October 2007