When nothing is selected, the tab key works, but shift-tab doesn't do anything (should unindent). Nor tab nor shift-tab does anything when selecting multiple lines (to indent/unindent a whole block of text).

FTL (and HTML) needs to be indented to remain readable. Thus the plain text editor of Eclipse (where indentation commands works as expected) still is often more usable for editing templates than the FTL editor.