Some other DAWs allow clip splitting to automatically create a crossfade at the split point, instead of 2 adjacent clips. It would be great if Sonar offered this too. ie. When you split a clip, instead of ending up with 2 clips that are right next to each other, you get 2 slightly-overlapping clips that are cross-faded.
The primary benefit of this is that you can use this for very efficient 'manual quantizing': split a drum track slightly before a hit that is too early or too late, then slide the audio within that clip to align the transient with the grid. Because the crossfade already existed, no more work needs to be done on that hit.
Compare that method to the one described in Dan's blog post (
http://blog.cakewalk.com/drum-editing-splitting-clips/) where he has had to split the clips, quantize them, then crop them, then find a suitable place to re-join them, and then slip-edit both sides to match. This is a more laborious method - what little you gain in being able to auto-quantize the hits you more than lose in having to manually slip-edit both sides of every split.
Apart from drums this also makes a good artifact-free way of editing other transient-heavy sounds like acoustic guitar and bass.
The crossfade operation would ideally have options for length (in samples/milliseconds/whatever), and a choice as to whether the fade should be entirely before the click point, centred on the click point, or after the click point.