default keyboard shortcuts, the ones hard-coded to the qtractorMainForm.ui (and qtractorMidiEditorForm.ui), are NOT erasable nor re-assignable, sorry.
at least across program sessions: while they may seem possible to erase the original default assignment, it won't survive to next program run cycle. sorry again.
this is known issue and to date nothing has been devised to circumvent or work around it. so sorry again.
nevertheless, you're therefore encouraged to file a ticket if nothing just worth as for the record ;)
default keyboard shortcuts, the ones hard-coded to the qtractorMainForm.ui (and qtractorMidiEditorForm.ui), are NOT erasable nor re-assignable, sorry.
at least across program sessions: while they may seem possible to erase the original default assignment, it won't survive to next program run cycle. sorry again.
this is known issue and to date nothing has been devised to circumvent or work around it. so sorry again.
nevertheless, you're therefore encouraged to file a ticket if nothing just worth as for the record ;)
hth.
cheers