RE: TAB when the region is active

[Drew Adams]

> What would be useful to do in text modes is to make a similar change for
> M-q (`fill-paragraph').  When the region is active in transient-mark-mode,
> then M-q would call `fill-region' instead of `fill-paragraph'.

I'm not so sure. There are several possibilities. A case could be made for
any of them to play the role you see for `fill-region':

. fill-region - Fill each paragraph in the region.

. fill-region-as-paragraph - Fill the region as one paragraph.

. fill-individual-paragraphs - Fill paragraphs of uniform
  indentation within the region.

. fill-nonuniform-paragraphs - Fill paragraphs within the region,
  allowing varying indentation within each.