a) Someone familiar with the frontrow class methods would have to spend the time doing the programming and testing. That person would also need to be familiar with the internal structure of Boxee to merge this with Boxee source code and make sure it does not cause problems with the other platforms.
b) Only quicktime compatible video content would work, that means forget about MKVs.
c) It would only work under the appletv.
In other words, developer resources are not unlimited and it's not as simple of just changing a few lines of code.