i just checked again to see the status of Cloud because i guess sooner or later we have to switch over from myBalsamiq - unfortunately there is still no way to get any “meta information” into an export.
We use custom properties excessively to create a whole app-translation-workflow that works flawlessly - our clients translate the apps themselves, inside myBalsamiq, then we export all Mockups and transform the exported Mockup XML to string files for apps. Inside the custom properties we keep the keys/ids, it is perfect (no one has to see them but in the export they exist).
Are there any plans to have maybe just one additional fields for notes in the properties inspector for elements? Would that not be a very minor addition? I guess we could then switch immediately…