Hm.. I don't think that'll solve the problem. What I want is to be able to LOCK the screen in landscape mode, the same way that you (with iOS 4) can lock it in the default mode. That way, when I lay down in bed with for example Safari in landscape mode, it won't turn around.
yea rotation inhibitor should work. and as for compatibility, all you should have to do is install it and see. if it doesnt, uninstall lol.
there is also another alternative but you will have to search cydia for it as i cannot remember what its called. also, if your like me and many others who use the SBSettings app, there is a toggle for this sort of feature you ask for. again, not sure if its IOS 4 compatible, but its nice an handy to use in almost all apps.