It is an Interesting feature, I added it to the possible features list a while back.
Any time a new feature request comes in, we have to think, about the usability implications. What parameters should be exposed to make the most of the added feature? Is there space for them in the menu system? Can it be fully backwards compatible? What changes are needed to the documentation? etc ...
This one is pretty complicated because of these reasons (beyond the non-trivial coding effort required) so it's unlikely that you'll see it released from us in any time frame ... the code is open source, though ...