Zac @ Soulver: sure, I keep a snippet of text near my personal finances calculations with some notes on my long-term goals, it's currently a sequence of one-line comments, but having just a multi-line comment where I could freely put stuff without prefixing every time I enter a new line would feel a bit more convenient IMO.

Daniil Kolesnichenko: For what it's worth, you can paste/type the lines, select the whole lot, then hit (the shortcut for the menu item).

I find this to be quicker/easier on the odd occasion I need multiline comments.