'track editor'
Are you talking about the Beat&Bass-editor?
Open the pattern in piano-roll, and you have completely free placing with snap in all Q-pos.
(i moved your topic to 'wish.list')
Make sure to search to see if your idea has been posted before! Check our issue tracker as well, just to make sure you are not posting a duplicate: https://github.com/LMMS/lmms/issues