What I find confusing is being able to select with Ctrl+Click or Rubberband... In fact, I thought the lock (or sensitive) state of a layer would be applied ( not necessarely propagated) to all the objects it contains.
I'm not a graphics professional, I only try to draw basic maps as a hobby. I can easily understand that my needs don't match those of the majority. Layers are really useful for me, but the fact the the object they contain can be selected even when locked confuses me a lot. Let me explain : let's say I've got a reference layer with reference lines, and some bitmaps, and additional layers with text, buildings, water, streets... When working on a specific layer, i want to see the others but not modify anything in them. At the moment it's not ok (at least for me), as rubberband selection (my favourite one btw) can select ( and then modify) them.
A workaround is to lock objects individually, but then, unlocking them one by one from the xml editor is a pain...
regards,
matiphas