I seem to be having a bit of issue with the keypresses registering in some mods. It's happened in a couple where the keys just don't seem to be noticed but the main example I can think of is Form ID Finder 4. I've tried it with the mouse option and with the mouse option set to 0 and the keys set to 'o' and 'p' but it still doesn't seem to register.
The only time I have seem the screen work was once while switching between another app and oblivion the form id scroll popped up.
Keypresses do work with Running Revised - for sprint key.
(This may be a wine issue as I am running oblivion through wine in linux - sorry if this complicates things.)