[TxMt] Is it possible to simulate EMACS-style selection marks?

[Kenneth McDonald]

I'd like to be able to set an explicit "selection mark", as can be done 
in EMACS, and then to cut or replace text in the selection range. (For 
non-EMACSers; the selection mark is similar to a bookmark, but indicates 
the 'other end' of the selection range, 'this end' being the location of 
the cursor. Under most GUI editors, moving the cursor deselects 
currently selected text, while under the mark selection style, the mark 
stays in place even when the cursor moves, which is great the text you 
need to select spans more than one page.) Looking at the relevant 
section of the TextMate manual didn't indicate anything obvious, does TM 
have any sort of support for this style of copying/cutting/pasting?

Thanks,
Ken