[Users] Pools and pre-started VM in 3.2

[Gianluca Cecchi]

Hello,

f18 node + f18 engine, both in 3.2 final.
If I create a pool, the "prestarted VM" field is grayed out.
See:
https://docs.google.com/file/d/0BwoPbcrMv8mvN3d2a0drb0szYk0/edit?usp=sharing

After creation of this 5-VM pool,  I can go and edit it and set 2 in
prestarted field, and after several seconds 2 VM are correctly started
by engine.

Do I have to configure any engine parameter to be able to set
prestarted VM at pool creation? Or is this the expected behavior to
set only on edit?

Thanks,
Gianluca