Hey Dan,
Thanks for this feedback! We actually have had a number of product suggestions around the signature widget. I am going to link them here to help consolidate and also raise the priority of the request.
[Add "On Start" trigger event for Signature widget]
[Customising the electronic signature widget - #2 by ASharp-J]
I will also check internally to see if I can get a better understanding of if this is being addressed already!