As example of the new “MIDI-filter rule system” features, you can split our keyboard like that:
MAP CH#0 NON#0:45 => CH#1 NON#0:45
MAP CH#0 NOFF#0:45 => CH#1 NOFF#0:45
When playing in channel 1, this will map the lower notes (until A-1) of your keyboard to channel 2. Easy!
We can make simpler by adding a learning procedure … proposals? 
Enjoy!