Question How to I modify the scripts of a plugin so that a possibly missing parameter will appear in triggers

[haroldwithlove]

Sometimes when I want to trigger the action on a plugin, I found some parameters of that plugin are not triggerable. For example, Miscreated reality's great body bundle plugin has quite a few parameters not showing up in the trigger system of VaM. Namely I can adjust those parameters in the body bundle plugin but I cannot adjust them in VaM's trigger system (not in the list of receiver target!)

I suppose this can be easily fixed through editing the script (I suppose VaM scripts are open-sourced). So which parts (sentences) of the plugin script determines whether a particular adjustable parameter will show up in VaM's trigger system or not?