Here is a link to the manual section where you can view all the short cuts/hot keys: https://www.pgmusic.com/manuals/bbw2022full/chapter15.htm#keystroke-commands-hot-keys

According to this list, ctrl+A is "Play song with no generation".

The spacebar can be programmed to do a couple of different options, which you can find under Options | Preferences.

While it's not a command specifically, you can go to Edit | Copy Special | Copy From ... To if you want specific regions, or you can go to Edit | Copy and the content will be copied to your clipboard (you can also do this via CTRL+C to copy; you should see a yellow flash message that comes up saying song copied to clipboard as text if successful).

Hopefully this helps!

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Cheers,
Ember