multimove/multiteach with external axis?

I was able to use multiteach a very basic setup now, no luck with the real one (2 external axes).
is it OK to mix moveJ (for axis) and MoveL instructions?

Does it know External Axis? 40512: Missing External Axis Value

Changing instructions to MoveExtJ, can I tell multiteach somehow?

I finally got it work with all jointtargets and some RAPID hacking, its a start.
To me it looks like the secret sause of multimove wizard is to make one robot to be auto calculated (jump to).
Will it work with joint targets for an axis? Multiple robots and paths?

Any way to do the same in code? How many robots can it use? All examples are 2?

I think as soon as I add an external axis its jointtargets only and it multimove wont play along?
Was the arc welding example done with multi move?

I can only find this thread of somebody trying without luck