Ctrl_I was yours. (I can't remember when it appeared) But at that time I couldn't get the word from current caret position (or maybe was too blind to find and enable it in ide settings) so I added my own version. It was more than 2 years ago...
The lesson for me "allways check all possible menus!"
On the other hand, in forums there are plenty of questions , e.g , like "How to comment a selected block?"
Shouldn't be all goodies set true by default?
Well, a) I have learned to be conservative, prefer to make pre-existing mode default (I have made big exception with Find and Replace though) b) Personally, I find "Comment selected block" extremely annoying