This is one of the biggest holes in Sonar imo. A well integrated drag and drop type of sampler to trigger, edit, and manipulate loops and one shots. There's very good examples out there of where to start. Something along the lines of Ableton's Simpler/Sampler
(probably the best out there right now) or something even as simple as Studio One's SampleOne. This is very critical for electronic musicians/producers who are not in the world of live instrumentation. Yes, there are 3rd party options like Kontakt/Battery, but the point is you really shouldn't need a third party app for this relatively basic functionality that a lot of the main competing DAWs have out of the box. Plus, those apps can be buggy and resource heavy sometimes
(not to mention pricey) when all I want to do is something basic like edit and trigger a drum sound or sample.
I think DropZone may be a good starting point/foundation, but it definitely needs an overhaul/update, and some additional functionality. And the fact that it has not been updated to 64bit makes me think there may be some sort of issue with it.
This is just my observation and opinion based off of what I've seen while networking and collaborating with a lot of different producers and musicians.