I'd love to make it iPad compatible with the new version I am (slowly) working on. But there is a good chance I never will own a iPad ;) Have to see if I can co-work with somebody on that.
Do you have a Mac? You can run the iOS simulator and figure out when it's popping up and roughly what it looks like. In this case the problem is you're setting focus on the search field.
In iOS the keyboard automatically pops up when there is an input field focused. That's also why you need to have a touch event to set focus because it gets annoying having half the screen disappear (so for example when visiting Google the keyboard does not pop up and the search box does not have focus).