Hi Jens -
please check the help system/user manual for "action macros". You can embed commands on sequence steps in your main sequence that will start a sequence on a master playback. You could probably make a macro that just presses go on that master playback and then at the end of the sequence on the master (seq 2 in your example) that triggers the restore step on the main playback, getting you out of the go loop, if you know what I mean. If not, let me know and I'll try to write a more coherent response when I'm no longer on a train.
Thanks!
Sarah
www.etcconnect.com