Guidance on Ahead of Time Compilation for Mono 2.2?

Does anyone have recommendations on using ahead of time compilation for the system libraries under Mono 2.2? The Mono website has this article with some (outdated?) information about how to carry it out. I tried following the instructions with the following exceptions:

• I found multiple mscorlib.dll assemblies (at /usr/lib/mono/1.0, 2.0, 2.1) and tried AOT-compiling all of them. Only the 1.0 and 2.0 assemblies succeeded. The 2.1 assembly kept referring to the 2.0 assembly and never produced the .so file for itself.
  
• Several assemblies (System.Xml.dll for one) in the GAC failed to precompile. The AOT compilation process for that one complained that it could not load the System assembly.
  

When I tried executing Mono executables (themselves also AOT-compiled and working prior to my pre-compilation of the system assemblies), they universally failed with Mono framework errors.

Has anyone successfully AOT-compiled the system assemblies under Mono 2.2? Is this even a good idea, assuming there's a way to make it work?