Unfortunately, this cannot work for layers because of block hierarchies.
The drawing order of an entity on a layer in a block is defined by the drawing order of the block reference. It cannot be moved further back than the drawing order of the block reference.
Example hierarchy:
A) Line on layer "0", drawing order 0
B) Block reference on layer "0", drawing order 1
B1) Line on layer "0"
B2) Line on layer "red"
C) Line on layer "0", drawing order 2
Moving layer “red” to the background, would only be possible if the block reference would be exploded.
It’s possible to change the order of A,B,C and the order of B1,B2 but not something like B2,A,B,B1,C
Okay thanks for the explanation Andrew, it was just a Friday thought, you know what they say - ‘if you don’t ask, you won’t know’.
I completely understand how my request would not work efficiently with blocks, however I still think an option like this may have some benefit in the preliminary/construction stages of drawing, If you start a lot of drawings from scratch like I do where no blocks are initially used it would be useful. My opinion here is coming from experience of using QCAD for lots of original ‘one off’ (no blocks used) drawings!
