How to set orientation if the option isn't listed?

If the Pixhawk is mounted pitching down 45 degrees and roll 90 degrees, is there a way the standard options in the dropdown menu can be overridden and the correct orientation entered manually?

@gcelec, this orientation is actually the same as “Roll90Yaw45”. There are quite a few cases in here where the order is important and I think every possible 45 degree orientation should be represented.

-Rusty