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You could create a custom hotspot button that is whatever size you need a have that execute formula command EditInsertSignature (https://help.hcl-software.com/dom_designer/12.0.2/basic/H_EDITINSERTSIGNATURE.html).
That would be a way you can solve the issue with whatever size button or hotspot best meets the need of your application.
We will not be changing the size of that button as it will not be in keeping with our design schema.