This add-on will remove user signatures from selected node(s).
Before:
After:
Options: You can select required forums as per below example.
Installation:

Before:
After:
Options: You can select required forums as per below example.
Installation:
- Download Add-on & extract the archive.
- Upload contents of [upload] folder to your board root e.g. [scr] folder in [scr] folder.
- Login to ACP, go to Add-ons and select Install option.