I have never understood the appeal of "Selecta".
Whilst in theory you can run multiple trains at the same time, I have yet to come across a human being that can handle more than two tasks "at the same time" without crashing the locos.
I like the flexibility to have one controller that can control 12 individual locos. I use DCC for my electric kit, Revolution for some of my battery, and RC Trains deltang system for the other battery and also for the live steam.
I have controlled two different types of live steam shay in a 'lash-up' by using two different numbers on the 'selecta' and this would probably be the limit for my muti-use with live steam. This enables each loco to be set-up and 'de-condensated' individually (using the two choices on the 'selecta' from an easy to hold single handset (in case they are not totally in sync) and then set off to do their thing by just flicking between the two bound 'selecta' numbers corresponding to the locos. And yes I do understand the principle of binding two locos to the same frequency channel on one controller (or 'selecta' number) but with two different live steam locos it is probably easier to be able to trim them individually from one controller than using two different ones.
But I also have some battery locos bound to the same controller and it is really convenient, if you want one loco to behave in a certain manner on one section of your layout, leave it running doing its thingand just to run to another of your stable, and control that one on another section, and even another one on either the same section or on a third etc etc, then the 'selecta' makes it easy to do.
This does away with having multiple controllers, (one loco (or maybe two ) to one controller)... so you end up operating a bit like operating with various DCC addresses, or using Crest 'Revolution' ability to have up to 99 locos stored in one controller.
Yes I do take your point that you ave to know what loco corresponds to what number out of 12 settings on the selecta but that is not too dissimilar to remembering what addresses correspond to which locos with DCC, or the Revo system etc etc.
Tony, I do realise that you are going to prefer the system that you retail and will try to show that it is a better system and that another one may give or offer too many choices than you think is necessary etc (the 'selecta'), but if multiple loco control with DCC (or 'Revolution') was too much trouble and not a good operating environment, then we would not be given the option to have many locos running at the same time with individual control from one handset (with only input of address needed to switch from one loco to another).
In fact the DCC Massoth Navigator gives the option of only two locos being directly controlled at once so DCC addresses have to be juggled if you want to operate more locos or the use of 'consists' or using another Navigator for those with deeper pockets.
The 'juggling' of addresses does mean that there maybe a loco or more not being directly controlled, no different, in fact, to the 'selecta' operation.
It is a least easier, than in the DCC electric world, to switch between your different battery or live steam locos using one 12 position rotary pot.