> My solution is to have C+[ and C+] mapped to Shift Indent Left/Right.
> This makes it easy to increase/decrease the current line indentation.

In jEdit one can increase/decrease indent using ALT+(left arrow) or
ALT+(right arrow).  I think this is set by default.  Works on multiple
lines as well (so if you have more than 1 line highlighted, the indent
will be applied to all of them).

Matt