I am using a LinkStation II (MIPS CPU), so I don't know exactly why you face some problems using the 'testing' branch. Maybe you can post the problem you face in another thread.
I have tried mldonkey for a short time, and then I remove it. It is too heavy (both CPU and RAM). For the same torrent, download speed in mldonkey is <100KB/s while that in rtorrent is 1000KB/s!