Zebra2 sizes: custom size possible?

[wackazong]

I am currently experimenting with showing the zebra2 interface on an iPad and using it via touch rather than mouse. I use the Duet display app. Works quite nicely so far. To optimize the experience and use all the available screen space on the iPad I would need a size on the interface of about 125%. Any way I can edit a preferences file to accomplish this? Thanks!