Answered
i was trying to find through the forum an obvious answer, which finally came to my mind during the quest.
can you create a list that changes depending on the values of a certain number of checkboxes?
yes, of course (here you'll get an example of it). but when i was trying this particular code, it didn't work as expected...
Scene=Si[R2≟"true", Si[CV≟"true", Ltt, Ltf], Si[CV≟"true", Lft, Lff]]
and why not? just because of the ""! the correct version is:
Si[R2 ≟ true, Si[CV ≟ true, Ltt, Ltf], Si[CV ≟ true, Lft, Lff]]
my doubt has been cleared now, but i post it anyway just in case it can help anyone.
The same question 
Shortest possibility is
Si[R2, Si[CV, Ltt, Ltf], Si[CV, Lft, Lff]]
You can also use that
true = 1
false = 0
so you can also use
Element[{Lff,Ltf,Lft,ltt},2*R2+CV+1]
kondr is faster than I ... :P
If you have several checkboxes like c1, c2, c3, ... you can get the number of checked checkboxes by a term like:
n = c1+c2+c3+...
Birgit
very nice idea, indeed!
about 0 and 1 as equivalent to false and true, i remember trying to use it in the past, but probably i did it wrong and never explored it anymore.
thanks for both useful comments, kondr and Birgit!
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