A desktop version is definitely still in the works, we've actually spent quite a bit of money obtaining the necessary licenses to develop one; it'll likely be out a few months after the rest of 2.0 (probably along with 2.1 releases of the Palm/PPC versions that enable sync support). The delay is partly because of the fact that everything else in 2.0 is running behind, but mostly because we want to have the PPC version nearly finished first since the desktop version will be very closely based on it.
Regarding PenPower, I'm afraid that's really not something we can do a lot to fix - they patch the system at a lower level than our software operates, so we can't really do anything to keep them from grabbing stylus input. And they don't provide an interface (or at least don't provide one we're aware of) for other programs to disable/enable their software. So about all I can suggest on that front is that you enable Input Field Compability mode and use PenPower for handwriting input in PlecoDict along with using it elsewhere on your Palm.
Regarding PenPower, I'm afraid that's really not something we can do a lot to fix - they patch the system at a lower level than our software operates, so we can't really do anything to keep them from grabbing stylus input. And they don't provide an interface (or at least don't provide one we're aware of) for other programs to disable/enable their software. So about all I can suggest on that front is that you enable Input Field Compability mode and use PenPower for handwriting input in PlecoDict along with using it elsewhere on your Palm.