[FrozenIpaq]

If you grab a skinning program such as Wisbar Advance you might be able to edit the size of the button (well I know you can). Not sure if this will improve your accuracy with hitting it or not but it's always worth a shot - Wisbar Advance is a great skinning application and is one of the first things I will put on my new HTC Touch Pro when I get it in the next week or so (or I hope so).

You might have to create or alter an existing theme since you can't just pick and choose what elements you want to customzie while leaving others activated (it's been a while since I've used WA so who knows)