Snapping to shot changes

[Vioguy]

I working for a client that does not provide a paid program to use and I would like to know if I can do the following.

Once the shot changes are detected, I want to set SubtitleEdit to 1. automatically move subtitles to shot changes. In my case, I would tell it that for every Start-Time less than 12 frames (before or after) from a shot change, to move the start time directly to the first frame of the next shot. However, for any End-Time less than 12 frames from a shot change, it should be moved 2 frames before the shot change. That's because the start of the next subtitle would start at the shot change and there should be minimum 2 gaps between subtitles so the end of the previous subtitle would naturally sit two frames before. This would be done with a press of a button or also manually, where the Start and End times would snap according to what I've described.

Is it already possible to do this? I'm trying to see if I can get away with not buying an Ooona subscription.