Yeah, the "pause key" bug is just a keyboard clash. Basically keyboards have a wire matrix and work out from different "closed" or "open" responses which key (or keys) are being pressed. Unfortunately many when (I am guessing the keys) down and enter is being pressed will not recognise 'p' being pressed... you can try it in a text editor or something. My "fix" is to release a version which allows configurable keys. In the meantime you *may* be able to use other keys (do hjkl) work? ie use these when you know you *need* to perform some accurate move and you are too lame to play without pausing (hey, I've even resported to pausing since hte high scores are just too high otherwise). Or change keyboards!
I'm not sure when I'll have time, but I plan to upgrade some stuff over summer. I was hoping to put out a mac version, but the Java versions and web pages including editor are also high up there. Then there's playing. asarkila seems to need some competition!
I'm still amazed at how enjoyable a quick bd4 bash is after so many years ... and that new methods seem to keep popping up!