Structure Browser in modeling supports customizations about Browser Views (with command sd-create-browser-view), you can add your views with your columns (sd-create-column-definition). You can define view and edit functions for each column (display-fnc and edit-fnc) but you can't define constraints about values inserted, like a drop-down list. I need it.
The same feature is naturally present in Creo Parametric (with restricted_val_definition):
I've just tried to ask it in a ptc case 13980076 with this response:
I spoke with my colleague and he is also the opinion that this is not possible with IKIT. I think you know where to find the complete documentation of IKIT. Please see following article. https://www.ptc.com/en/support/article?n=CS118457 If you want you can submit a product idea.