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Re:iPad onscreen keyboard designed for LaTeX [video] by jawaddeo on Monday January 27, 2014 @09:15AM (#7130339)
(Disclaimer: I'm one of the people behind Texpad.)

Keyboard is designed to address precisely these kind of issues. I'd recommend watching the video.

Re:iPad onscreen keyboard designed for LaTeX [video] by sebastianavina on Tuesday January 28, 2014 @02:23AM (#7135845)
I'm just guessing, but i can't see any way any custom app could be more efficient than a well tuned emacs.