Its a script original coded by niobium, which allows you to splitt a build queue through all selected builders.
After 0.87 it stopped working, so i tried to repair it, which is almost done (but the overtake of the old queues)
it workes with ratios as example:
10 buildings 20 cons --> 2 cons per 1 building
10 cons 20 buildings --> every con makes 2 buildings
--> super usefull for defence lines dragon teeth,... or building multiple nanos
for tryout make 50 cons and try to build 100 nanos the classic way and than try the same with META holded
Attension it deletes all your old queues of the cons !!