Re: Thinking outside the box: Special Effects and odd powers
I think if you enforce too much in the way of those mechanical descriptions, you remove the potential for the use of limitations and advantages. Blast may be bought with "No Range" and now it's deviated from your description with but a single modification, for example.
That said, I'm definitely of the school of "buy the powers you intend to use all the time" rather than "you didn't pay points for that, so you can't ever do it."