Is it possible to add spring/jiggle physics to a rigify metarig? As the title says. I have found plenty of addons to do spring physics for bones.
But all the ones I tried rely on custom properties that wouldn't carry over through the rig generation, and I could add those properties to the generated rig, but it being a much more complicated one and losing the ability to re-generate the rig if I want to add more things to it afterwards is a drawback.
Didn't actually find an answer to my own question but did find a workaround, so I am posting in case it shows in search results.
Basically, while applying the addons to the bones in the metarig don't work as far as I see, you can apply it to the drivers in the generated rig and those do survive a regeneration of the rig.
I found that works best to apply it on rig types for single bones (like basic.super_copy or basic.raw_copy) or bone chains controlled in a FK fashion (like basic.copy_chain)