No, linking channels 1+2, 3+4 etc. is a fixed setting, which all manufacturers of not too expensive boards use (X, M, TF, Qu...). There is only the possibilty to use different settings, e.g. on channel 1 and channel 2. The linked channels take the settings of the channel from which you link which means that you can use different sounds just by changing the linking.
As time goes by a band-setup or instruments CAN and WILL change, so just take the linking options as they are. If you are using DCA groups it anyway doesn't matter what is linked where and why or not... ;-)
