I forgot where it was discussed originally, but being able to mark yourself at will is incredibly powerful. Adding a patch that adds mark to scroll of noise would be an interesting experiment, but I suspect all it would do is trivialize a lot of branch ends and other tough levels by forcing everything into convenient locations (killholes or some other chokepoint).
For example, I could just make a killhole in Zot:5, mark myself, and just go on a rampage as everyone exits out of the orb chamber and walks into the killhole one by one and never have to worry about fighting a nasty group of enemies.
It could have some fun uses though. In a Crawl without ctele, you could try marking yourself to drag everyone out of a rune vault, shaking them off by getting rid of the mark and then teleport and/or invis, snatching the rune, marking yourself again at the rune vault and finally teleporting again.