Just an enhancement on the agent, you can see the setting pushed from the broker in the standard machine.id field - that part is essentially unchanged from VDM 2.0:
...;vdi.broker.disconnecttimeout=XXX;...
Looking at it though, I think this agent behaviour has been in there a lot longer; since View 4.5 in fact. I see it locally, I'd be interested to know if you don't. As I said, you do need to wait for the agent to pick up the setting, it's not instantaneous.