I think this should be part of a larger overhaul of the layer manager.
I seem to remember reading somewhere here on the forums that the current incarnation of the layer manager was written using the macro language functionality, and I think it's a bit too complex/heavy to be implemented in this way.
It loads sluggishly, waves of refreshes cascading down all the combo boxes and edit controls. Editing layer information is plagued with lag, and the choice of layer selection highlight color destroys any ability to visually determine text selection status. Normally we could fall back on feeling our way around blindly with HOME and END, SHIFT+LEFT and SHIFT+RIGHT for more precise control over text selection, but these keys have not been given intuitive, consistent mappings. One subtle wrong move, and something else gets selected, deleted, replaced. At this point, you might be thinking you could rely on the warm security of Ctrl-Z, but NO! That doesn't apply to the currently-focused text edit box, but instead to the global program, mysteriously and quietly reversing some other action you've made previously but can't remember what, causing further damage (although you can hover over the re-do button for a hint).
The modest quantity of layers commonly present in many .dwg files is enough to convert a trip to the layer manager into the software equivalent of crawling through a room rigged with laser trip mines, and it's been this way for an unacceptably long time.
Please re-write the layer manager!
*Mild dramatization added for effect.