if I remember it was ----U, ctrl + 1, 1, U,---- it was possible to stack any burrowable zerg units. Yes it has been patched, but you can still stack your miners if you have a geyser you didnt build on. Simply (as fast as you can)

1-select ur miners,
2-right click the gas,
(hold shift for step 3 - 5)
3- re-right click the gas,
4- move or attack order somewhere
5- move or attack order somewhere

once step 4 has been done by the miners, they will do step 5 automatically, there can also be a step 6 - 7 -8 -9.... until you see "unit's waypoints is full"

example: you order them to attack a canon on step 4, then another canon on step 5, and then head for the nexus on step 6.

if you want to stop them from doing the orders, press "S" or click "Stop" on while selecting the units (ofcourse Duh) xP have fun stacking