where is the problem ? it happens the same if you are on satellite mode and want to switch from an astra channel to a hotbird channel. No matter how you do it, if you want to switch from one satellite to another one and you have a motorized dish you will always have the same problem, no matter if you can mix or not the channels. In the other hand If you don't want to mix different satellite channels nobody will force you to do this. Other people using single satellite or twin LNB (i have even seen dishes with up to six LNB) will have no problem switching satellites.
you are assuming the software will force you to do things that you don't want, and this is just the opossite. The software should not force you to do what you argue. The software will just let you mix the channels if you want.
Other receivers just have colections of channels (one for terrestrial channels, one for iptv, one for each satellite, etc ..) which each specific numbering each one and the they let you have custom collections where you can mix just the channles you want from any source (aka favorites). So you can browse each source just as now or make you own custom channel list as use it as default channel list,
