Block comments should be supported within a standard function along with the existing single line comment (//). Who wants to single line comment several lines and then later potentially remove the comments? Sure there are other ways to go about it like cutting out the text and later pasting back in but block comments would be better.
If not block comments then a menu item in command editor (with key shortcut) to toggle single line comments on the selected text.
/*
Multi
Line
Comment
*/