Transfuser 'One-Shot' play mode comes to mind Russ. Personally though I'm in two minds about a one-shot play mode or latch mode regarding Structure. On the one hand (no pun intended) a single strike of a key or keys should sustain the sample length or loop in playback whilst on thee other the current workflow is gate length. IMO maybe a check preference.
It's a request made on the DUC by many users.
filosofem