[sldev] MONO: region request.

[Argent Stonecutter]

Turning off the old code will not necessarily improve performance.

I am totally impressed by how far they've come with Mono, because  
I've been involved in similar projects to replace "old code"  
interpreters in realtime systems with more modern systems, and  
there's all kinds of pitfalls involved in the process... because  
unless an interpreter is designed for realtime it's very very hard to  
get good realtime behavior out of it.