elovikovThat's why I love community!Talented people communicate with each other.
Yeah, I think the only way is python api (or vex, but you still need to pull somehow values to parameter).
I have a little example for Transform LOP. Something similar to pivot tool in omniverse.
It's just setting pivot relative to bounding box with exposed controls.
(It's just an example, would be better to package it to little hda to avoid complicated expressions)
Thank you so much for sharing, I was diving for the API in the USD documentation, you saved me a lot.