In other products or even on recording hardware I have seen the feature to play a defined section only one time. It is similar to the loop function, but it plays the selected section only once, stops and then sets the now time back to the section's start position. This is especially useful, if you are editing a very short section or checking a single transient setting that is difficult to define. If you use the loop function for such a short piece, it is very difficult to grap the contents as it goes to fast. But with such a one-time play feature you can start play, listen and get it. And after the stop you can play it again, until you really find out how that position must be.
I am missing this feature really, that's why I use other software outside of Sonar to do that now.
What do you think, wouldn't it be a useful feature? How do you listen to very short sections for decisions on say timing issues and so on?