extending hom parmtemplates

[mrice]

Let me explain

I need to dynamically create menus on an asset which have dynamic menu items.

Doesnt sound like a big deal except that the item_generator_script argument to hou.MenuParmTemplate doesnt work as of yet (logged as a bug) and the hscript opsareds command isnt practical in this case (you cant use opsareds to create a single parm).

I thought a work-around would be to handle the menu items in the hdaModule, and replace the menu with hou.Node.replaceSpareParmTuple when it needs to be updated. This works, but in practice its *extremely* slow when the amount of parameters builds up. My guess is that behind the scenes its wrapping OP_Node::changeParmTemplate and that in fact all parameters on the node have to be rebuilt.

SO...

Until item_generator_script is implemented, is it possible to extend HOM to have, for example, a hou.parmTemplateType.ScriptMenu which wraps the PRM_ChoiceList "script interface" initializer?

PRM_ChoiceList(PRM_ChoiceListType thetype, const char *thescript, CH_ScriptLanguage language = CH_HSCRIPT);

and how would I go about doing so?

Looking at the HOM/ObjNode_setSelectable.C example, it seems straightforward to extend HOM that way, adding a function and binding it as a method to a class. But what about adding a new class to HOM that is treated as a PRM_Template?