rotobrush 2 should have something like drawing rectangle or circle beside of Brush
for exp: i want to roto a skateboard with complicated BG so it's maybe (maybe) more easier for PC to find the edge without adjust the effect control so much, when i try to draw something just need a strange lines, and circle for the wheel. As you can see with the picture below. Even the newest Rotobrush 2 beta, i found that the performance of Rotobrush 2 was improved (thanks for your team :D ) but it's still a little bit need to improve, thanks team!
Shawn Briscoe commented
Usually with geometric shapes, I find it easier to use a mask for cans, skateboards, etc. You can use the Mask Tracker. Let it track the whole shot. Then you have to go back and adjust the vertices, or points, on the mask as the shape changes in reality. For organic shapes, such as people, I use the Rotobrush. The new AI is better, but they've got to make it where it's not a resource hog. It propagates too much, and doesn't work on long shots.