Thanks, but it's a no-go on desktop composition. I hadn't considered compatibility mode come to think of it. I had LazyNezumi in mind, but haven't tried it yet.
Might have a possible answer. I know you said it was your mouse having problems but the pen tab is also a pointing device and after some searching I found the following seems to rectify any potential conflicts between pressure sensitive devices/pointing devices and the software utilising those functions; Right click, goto…