I'm currently exploring options to customize the UI in Houdini. I understand that the main menu can be customized via xml files, and that I can programmatically customize the Radial Menu. The things I could not figure out after studying the documentation for the last couple of days is:

Can I add buttons to the Display Options bar on the right, the Selector and Handle Controls bar on the left, and/or the Operation Controls bar on top of a Scene Viewer?

Likewise, I would like to add menu items to popup menus that appear when keeping LMB pressed over the Object Type Visibility Filter button (the one with the sunglasses icon) on the Display Options bar, or any of those menus that pop up from that bar's buttons.



Related Questions: Can I add my own parameters to Houdini's Preferences? I found Python methods to read and set them, but none to create new ones. Am I missing something?

Debugging: Can I relay output messages (Error messages, results from python “print” statements) to another (e.g. custom Qt) Window?

If any of the above is possible, please point point me in the right direction.

Cheers,

Stefan