Sorry for pulling up this old topic, but I registered here just to say a big THANK YOU for this thread, specially to the user Grimor.
I stumbled upon a Youtube video how to hack the recording time limitation but of course it didn't work out for my G81 (80/85) as well and I was very unhappy with the exclamation mark.
This topic here seems to be the only source on the whole WWW for solving this problem.
So, once again: thank you so much.