MIDI export: Problems with Drums

I have done a lots of work with digital audio, but little with MIDI and I am new to this rather exciting app.
I intend to use the app to put together scores I can then export to MIDI as guide tracks for studio recording.
This would be fine, where it not for the fact that drum parts tend just not to work right when exported. I've read something on this forum about PAS drum mapping as opposed to GM MIDI drum mapping, but whilst that puts a label on the problem it doesn't leave me much clearer as to what I can do about it. I'm really puzzled as to why this would be implemented in a way which makes MIDI export so awkward.
I would really appreciate advice on how most efficiently to fix these files once I have exported them.
I would also love to know whether the app is likely to be updated to help users avoid this problem.
I really will appreciate any help the veterans here can offer to someone feeling a bit bewildered!
I intend to use the app to put together scores I can then export to MIDI as guide tracks for studio recording.
This would be fine, where it not for the fact that drum parts tend just not to work right when exported. I've read something on this forum about PAS drum mapping as opposed to GM MIDI drum mapping, but whilst that puts a label on the problem it doesn't leave me much clearer as to what I can do about it. I'm really puzzled as to why this would be implemented in a way which makes MIDI export so awkward.
I would really appreciate advice on how most efficiently to fix these files once I have exported them.
I would also love to know whether the app is likely to be updated to help users avoid this problem.
I really will appreciate any help the veterans here can offer to someone feeling a bit bewildered!