This is good advice. Any FAQ on the signup page ought to be encouraging actions more than trying to scare them off e.g. "Can I use my Storageroom account for client projects" "Can I manage all my webapps under one plan?"

If you are asking questions on browser support I'd think the most important one would be to clarify that it's not iPhone/Android specific

You probably also need to think more about your target audience - is it more of a WordPress for mobile data (in which case the focus should be on ease of use) or a Rails/Django for mobile data (in which case RESTful JSON API probably is a key selling point)? As you're potentially appealing to both groups possibly separate tours for different use cases would work "StorageRoom for Publishers: content creation for non-programmers", "StorageRoom for Developers: develop in your preferred language and we'll handle the backend for you"