Glad you like it!!
We would love to add drag and drop editing at some point. If you’re comfortable editing JSON, we’ve made it super easy to modify tabs that way.
You can get the snapping controls or drop downs on your own tab by duplicating the tab (right click on the Model tab for that option). You can even get fancy and modify the options available in the dropdown. 
Yeah right now the custom tabs are kept under your user ID. So it’s pretty easy to copy tab files to all your alt accounts.
Syncing Studio settings / preferences in general is something we hope to make progress on next year.