[nemetroid]

From a quick look, the mentioned projects appear to be using a 2-space indent, but with 8 consecutive spaces being replaced by a tab character (with varying consistency - readline seems to do so always, the other examples less so).

> I'm sure they added tabs to give the convenience of being able to adjust the indentation to what I like

I don't think this is the case. It looks like the authors of those projects decided that a tab character always is 8 chars wide, and that one tab vs eight spaces thus only is a question of encoding the same thing. So they're quite far removed from the idea that each indent level should be a tab (which is what most "tab-proponents" argue for).