This was already implemented as a right- click option in the IDE previous to it going open source.

I think you're thinking of "Insert comments" (to existing text) which is not the same as "Paste as comment" (with comments pre-injected)
1. That's multiple keyboard or mouse steps compared to 1 hotkey pressselect all,Ctlr+B . doesn't work?

2. Re-read the original request... if you paste THEN insert comments, your text is reformatted by the IDE, for example words inside strings may be wrongly case-corrected.