one solution to get user definable quick start would be a command line support for arguments:
examples:
run-standalone.sh sleepanalyzer.py 2h10m
run-standalone.sh sleepanalyzer.py 08:30
run-standalone.sh sleepanalyzer.py recordonly
run-standalone.sh sleepanalyzer.py --preset "morning"

Then one could make shortcuts to the desktop for those which one often use.
Current preset system does not enable to quickly set like "start recording now and wake up after 2 hours"