I would like to see Better Touch Tool be completely silent about updates and never prompt the user about updates or pop up a dialog that says an update is available, when "Enable automatic update checking" is unchecked in the preferences. I prefer to check for updates manually when I decide to check.
Yes, BetterTouchTool interrupting my work regularly, just to advertise new features is a deal breaker. More than once my lecture was interrupted by blatant advertising that ignores all notification settings of Mac OS X, lets me walk to my computer, click something, and only then resume. I paid for a license and now I feel kind of sad. I will not (in good conscience) recommend BTT to any of my students or colleagues for fear of the same thing happening to them.
This has quite a few votes compared to many other feature requests. i would really like to see this happen.