I think it is ace and is way beyond anything I could do.
I'm still cheeky enough to suggest some improvements though:
Like Marc, I wanted to edit the default min and max, and found values on lines 921 and 1001, but still needed to click in the box and press enter for them to effect the value that the slider returns.
It'd be great if the context menu of the output plot still worked (so I could check peak response on a step plot for example).
The lock x and y axes buttons didn't seem to work for my plotyy graph.
