I’m pretty happy with Groove Agent except for the size of the pane and that you cannot resize it or use it in fullscreen-mode. Right now I don’t need a lot of others features added as the features that are most important to me already came with the last updates.
But I like using the standalone app as well, rather to build new kits and patterns to use them in Cubase Projects later on. It has some more advantages. It opens up faster, I can work with a finder window to browse for samples next to it without having my screen all messed up with windows I might not need at that time. Plus it saves resources. But the pattern editor e.g. is way to small to use it properly and you gotta frickle your way through it and use a magnifying glass to locate some things.
So, if u also are pretty much in need for this feature, bump this topic through the ceiling. Maybe we’re lucky to see that in one of the upcoming updates then.