I think the new-ish 3rd Person Improved is really nice but don't want to use it all the time. Could we get it added to the /viewtoggle command?

Or is there an easier way to select it via command instead of having to go thru the Options > Advanced > Game menu everytime?

+1, unless there's already a way to select it with /viewtoggle I don't know about

+1

This has now been added, as-of last night's patch: 1.8.765.

- Added "Third Person Improved" to /viewtoggle cycle, and directly with "/viewtoggle 9".