Dynamically Change Scenery Priorities

Hi to all,

Though I am not a scenery designer nor do I know anything about scenery :wub:  ,  this is probably the best place to ask my

question:

I am looking for an add-on or a utility that can change the loaded scenery priorities dynamically as I fly above/below a set altitude, say 5000'.

I want to load photo-real sceneries above 5000' and textured sceneries below 5000', I think that changing the priorities would force loading sceneries (?), it may take time to reload though, but it would still beat doing it manually and drastically interrupting the flight, especially since I run a 220 deg screen with 3 projectors and warped views in fullscreen mode with no visible menus. To change sceneires maually I have to exit fullscreen mode, minimize my FSX window, resize it, drag it to a normal monitor and do the changes then reverse this process back to the main screen!
Does anyone know of such an add-on or utility?
Does anyone know how to write such an add-on/utility?

I believe such a utility will be in good demand as it will solve the problem of having to run either/or textured/photo-real sceneries!
Thanks.

Ammar