Handling GM Midi Drum set in Beat+Bassline Editor

If one wants to use a GM drum of a soundfont, currently there are two ways for it (as far as I know):

1. On a single track, using Piano Roll, or
2. By adding several soundfont players in Beat+Bassline Editor.

See both versions here:

The problem with the first one that it loses the flexibility to manage in Song Editor (see top of the picture, with the lot of small patterns). The second one would be just great if there was a way to choose the sound to play in an easy way.

However, currently there is this lightgreen button over the piano keys (in window "kick", near C5 on screenshot), but this works kind of counter-intuitive, at least in this case. Often I am unable to figure it out, where to pull the green button to get the simple desired sound.

Would it be possible to have a way to choose the piano key directly? For example, by using right mouse button. Thank you very much!

Start by reproducing the GM drum workflow in the Beat+Bassline Editor and inspect how the green piano-key control currently selects sounds. No source file or test is named in the issue, so trace the editor's piano-key interaction first. Done means users can choose a desired piano key directly and use it for GM drum sounds without relying on the difficult drag interaction.