Group selection 1/3 or 1/4

Hi all,

It would be great if we have the ability to select a group of fixtures and then make a 1/3 of 1/4 selection. (like MA-tricks)
Now, it's only possible to make a odd/even selection.

Yes, in the fixture sheet you can generate groups, but it isn't realy "on the fly".

Greetz,
Ahmed