Hello Brinley, long time no hear :)
I have tried the jSignature now on an Ipad and found that when for example drawing a signature, or anything really the canvas is not always that fast. A quick search on the net got me to this page:
Could that be something to implement into jSignature for it to be more responsive to penstrokes?
This change can be applied via externally in the html via the meta tag and in css. I'll see if I can do it through the plugin.