Allow override of "Delete signatures not set as default/reply/optional" in Signature rules

Currently the  "Delete signatures not set as default/reply/optional" is a global option.

We'd like to be able to grant a few select groups access to maintaining their own custom signatures (based off of the templates that we provide via XINK). It could be great if it was possible to override/apply this setting via the Signature rule.

Also, it would be nice to be able to choose from either of the two options within the 1 setting:

1. Enabling this setting will delete user-created signatures, 

2. renamed signatures and previously assigned signatures

I find that we would like to always have "Delete renamed signatures and previously assigned signatures" enabled for all users, but not necessarily the "Enabling this setting will delete user-created signatures" for all (the way it is currently). Is there any way that the two can be split into two settings instead of 1? (I understand that it's probably difficult, which is why it's currently embedded into 1 setting).

Thanks!