Add a vertical type tool.
I'm a sign designer. I use AI and ID in tandem to output mass amounts of signs with variable copy (using data merge feature); such as unit IDs, where the numerals change. Sometimes the design of these include vertical type.
Not having a vertical type tool is crippling to my workflow, as I have to fumble my way through the type on a path option (which often doesn't space consistently, or do it manually.