Continuing diversifying my methods for detailing my clean maps, I've found the scaling texture lock becoming increasingly more useful.
However, there is no mentioned shortcut in the developer wiki for it, nor in the editor.
Is there any hotkey for it, or a way to assign one?

Shift+L

EDIT: sorry I thought you meant texture lock. As far as I know there is no short-cut for scaling lock.

http://forums.tf2maps.net/showthread.php?t=6005