Each modul8 control accepts only one MIDI info.
When you set up your MIDI map, and you send several MIDI information modul8 will only consider the last one you sent.
Modul8 accepts all channels, each time you enter a MIDI map it will memorize the channel as well as the note.
It there just small an error in the indication of modul8 and the channel is shifted of 1 (We will fix it in a new version).
e.g. 1/5 = channel2/note 5
e.g. 2/3 = channel3/note 3
Now if you dont use the channel 0 (all) and channel 16 in your MIDI map, it goes well.
If you only want channel 2 in modul8 you should only send MIDI notes in channel 2 when you set up your MIDI map.
This is quite useful when you have several MIDI controls as you can differenciate them by asigning each a channel.
I don't think this will change in subsequent versions unless you could share with us how this could/should be done.
Don't forget that most MIDI controls can also be configured.