I'd suggest that we (QF) do NOT do exactly the same. Personally I'm always ready to push when we request it. If something changes and for some reason I'm not able to push within 30 seconds of being granted approval I let ATC know. In my 13 years of domestic operations I've never seen it done any other way by any of the crew I've flown with.
I'm with you on this one Keg!
I've never known anyone at
VB to use those tactics described, and if ever we have had a subsequent issue arise after we have called for pushback which will delay us by more than 20 or 30 secs, we have cancelled our pushback!
Maybe the Tiger boys were just upset that we wouldn't "Lend" them our engineers to help with their little start problem!