Miele
I can only reinforce what Alan and Nick have already said. My Miele washer is rather newer but I can add a couple more points:
Soak is presented as a more ecological alternative to pre-wash - it may be possible to re-programme the length, mine is as it came from the factory at two hours. I don't think I have used prewash once in the 12 years I have had my machine, nor the short option - I now use the soak occasionally, particularly on whites, in my former, all electric home I used it regularly to delay the "proper" start to the wash till after the cheap, night rate, electric tariff kicked in.
I normally use the "water plus" option to assist with rinsing. If you live in a soft water area you will be amazed how little detergent you need - I have soft water and a full whites load will come out spotless with one (UK Persil) gel pod.
You really should not need to use LCB in your wash with heating the water from cold and the occasional use of high temperature washes should put paid to any sanatise concerns you might have. I use mine as follows:
Shirts - permanent press 40 degrees
Colourfast Cottons (inc. socks) cottons 40 degrees
Whites: T shirts & underwear - cottons 60 degrees
Bedding - depending on whether its white or coloured these usually get included in the whites or coloured loads - as I live alone they help make up a full load.
Towels - 75 degree - i dont actually consider I need to wash them this hot but it my way of doing a "maintenance" wash for the machine.
If I want a quicker wash for any reason I will normally use one of the permanent press cycles and, if necessary, give the clothes an extra spin afterwards as it only has a short spin.
If you make sure you dry the door boot and leave the door and drawer open for a couple of hours after you have finished the laundry you should have no mould issues.
I wonder if the button to the right of the time display is to set the delayed start?
I am glad you are pleased with your Miele washer, i hope you get many years use from it
Al