1. I would like to toggle selection comment. For example, when I'm replacing values in where clause, that looks like this:
Code
where my_field = 'my_val1' /*'my_val2'*/
I have to mark 'my_val1', press Selection comment button, then mark 'my_val2' and press Selection uncomment.
Marking whole 'my_val1' /*'my_val2'*/ and toggling comment would be much faster.

2. Sometimes I'd rather comment code block by adding double dash at the beginning of each line instead of putting it into comment block. With many lines it takes a lot of time, so it would be great if I could do it just by selecting and pressing the button. Maybe the Selection comment button could be a drop-down button (like log on) with block comment as default (/*...*/) and double-dash as one of options.