[Radiant] Add migrations on an installed extension?

[pixelnate at gmail.com]

I have a few general questions for all the Radiant gurus on the list:

- Can you add/create migrations on top of an installed extension?
- If so, is there a special Radiant way to do it?
- Will doing that create any problems when I/anybody tries to update the
extension from a cloned copy using "git pull origin master"?


Cheers,

Nate