I made a few rules including one 8 + 8 min rule and noticed that if you don't press snooze but let the alarm snooze itself, the snooze time is set by the system default, not the value in PM.

I also realised I might have a use for the extra precision with the alarm rule after all. If this is something that is very easy to do, please consider it. The seconds wouldn't have to show in the Ui in any way. Just that the updateRule method would accept second accuracy and that the rule would execute then. If this is at all tricky, forget about it, because it's not important.