I have been developing in B4A for a while now...and I totally love it. However, I have Macbook so I have to run B4A in virtual machine, which obviously requires more unnecessary system resources.
I hope that some day a Mac version will be available. However it requires an almost complete rewrite and the third party library that is used for the IDE UI (Actipro) is also not available for Mac...
You would be surprised at how basic Mono actually is, and how compatible it is with most things. My entire project which also interfaces with adb and Android devices ended up porting perfectly. I only had a few issues regarding HTTPS and SSL certificates (turns out standard .NET gives a warning while Mono gives an error, big difference.)
I actually did use their compatibility tool after posting in the forum. The result was not very good. The code editor uses many native methods for faster drawings.
There might be other possible solutions like building an IDE in Java so it will be supported by all popular systems. Time will tell...
Can I request that its PPC (Thats Motorola PowerPC architecture, not Pocket PC ) compatible?
I don't see why it shouldn't be.
It might also be nice for the rewritten IDE to be written in a cross-platform language like Java or Hollywood so that it runs on many platforms with one set of source-code.