Would you please consider implementing keyboard shortcuts for each sub-item in the Edit > Copy Special menu? I make extensive use of in-line comments, but whenever I copy-paste text from Scrivener documents I usually do not want to preserve said comments at all and half the time I forget that they even get included in the Ctrl+C shortcut.
A possible alternative that I would also be happy with is some sort of toggle that changes default Ctrl+C behaviour to not include in-line comments or footnotes.
As noted elsewhere, the plan is to some day have all non-dynamic menu commands available in the customisation list. The size of this task and its relatively low priority has meant it has become more of a gradually done thing rather than all at once. For that our priority is in areas that really serve zero purpose save for having keyboard shortcuts on them. For example a number of the commands in the Edit ▸ Select submenu offer no advantage to just selecting with the mouse. Next layer of priority are things one might use a lot, and yes, I would say the Copy Special commands, some of them for sure, do fall into that category.