How many different people use your iPad? Well my whole family uses our iPad to some extent and my 4 year old daughter nearly sent an email full of jibberish to a couple of my contacts. She just loves to type...and explore!
Well here is the solution, user specific platforms for your iPad. I assume one would be the admin platform and the others would have some "blocks" and advanced settings loaded.
This is just a prototype and it seems quite elegant.