A well rounded answer, but I'll pass for now. If Google really believed in your ethos of making the software more valuable via third parties, their platform wouldn't require dom hacks that could break without notice. i.e. they'd open up their own APIs to make building these sorts of apps themselves.

I absolutely commend you for what you are doing, I just wouldn't be willing as a developer to dip my toes in that particular water to spend the time developing something they could rip apart and break.

As a side note, the documentation page is broken on Mac Safari 8 on OSX Javascript error:

TypeError: undefined is not a function (evaluating 'reference.endsWith('()')')