A generally applied cut of length wouldn't sound very good in my view.
Probably ideal would be trimming your tracks at a suitable length and using that version in the library.
You could also cut the start if needed as well to a suitable intro point.
Second best (but workable), you can set the fade point (cue out) on a track (via the track data editor). If that were suitably positioned (and any cue in point as well) it might sound OK.
Is there a feature for Dance stations who don't want to play full length tracks with several minutes of "beats" at the end of each track. Need to cut all tracks at around 4 mins for example!
Will need to be able to set this for individual track groups.