I use events extensively, and the reminder feature is very useful. However, many of my events do not have a required time during the day that they need to be done, so I am continually messing with snoozing events and trying to find convenient times to set the snooze timer to. Leaving the window open is not really an option, because I have found it difficult to find an out of the way spot for it.
My suggestion would be to add a docking option to the window to put it in, for example, 1/3 of the timeline on the left side. I have tried just placing it there and scaling the timeline, but it seems to occasionally refresh back to the middle of the plex.
Doing a great job on TB9, by the way. I switched over from TB8 to using TB9 full time over a year ago, and have seen some really great and useful enhancements during that time.