I'm about to install build 80354 but I doubt it.
"Deploy immediately" for me sometimes works immediately and sometimes not. I have found that if you connect to a PC pending configuration and from the tray icon choose "apply configuration" it starts immediately.
Similarly if you reboot the PC it will apply straight away on reboot. Sometimes it will apply on the next time the agent checks in, but not immediately as this can be up to 90 minutes later.
I have noticed when applying OS Updates to a group of 10 PCs sometimes none of them start. Then modify the configuration and choose Deploy Immediately again and it works.
Regards,
Dean