starting with last revision I now name the themes .tmTheme (yes, should have done that from the start), and I'll be adding auto- import of themes (when double clicked) in 1-3 revisions. If the theme is “opened” and already installed, I'll make it switch to that theme.
This means you can then make regular commands which do: open ~/Library/Application\ Support/TextMate/Themes/mint.tmTheme
And you'll get the regular scope selector. If it turns out to be a hit, I'll rethink placing the scope selector in Fonts & Colors preferences :)
That is ideal! Thanks.