Yes, this is would be really useful! I also noticed that when you click on a primitive shape for several times, it activates the pen tool, and then the rounded corner option will be disabled!

Please make it possible to round corners on shapes made using pen tool!

Yes! Let's say you're making a checkmark inside of a checkbox. Now, the edges will always be straight, with no way of rounding them. Seems like a relatively simple feature to implement?

This is ridiculous. How .....???????? is it like this?

Seconded.

This feature is absolutely essential imo

Currently it is possible to round the corners for Rectangles. It is very important sometimes that we need to round the corners of some custom shapes created with Pen Tool. Please do something. :) Thanks

Necessary!!

Currently we can draw a rectangle and apply corner radius.
Wish we can draw other primitives like triangle and also apply corner radius on it.

It is useful e.g when drawing a dropdown icon.

Second this! Rounding corners on squares works well, but it would be great to be able to round corners on all other shapes as well, including shapes made with the pen tool and the path tools.