Erel, hope not to bother with another suggestion.
I am using comments to deactivate code temporarily as probably most others will. Since there is (afaik) no multiline-comment like /* ... */ deactivated code looks exactly the same like comments.
If you do not want a seperate multiline comment tag then I suggest a seperate highlighting color for double comments, e.g:
' comment
'' deactivated code
That would be compatible with the UI and comment buttons and allow easily distinguish comments and deactivated code.
Best, Nikolaus