That could only affect rotation/heading, not altitude... The problem with that is that is that depending on where you are on the planet, you may need a combination of Elevation and Heading change to get the desired adjustment. In some areas of the planet moving it around the compass would technically make it go up/down! Of course it could possibly be made more intelligent, where it assumes a local priority for the compass plane origin and thus adjusts both heading and altitude to achieve the desired rotation, but that could be confusing and frustrating in other ways.
Something to think about though...
- Oshyan