We should list values only in exceptional cases, so having a long list is not really a problem. I'm pretty sure we'll find cases with no fixed step size. In that case we need to use :values and can't use :interpolation. E.g. a sign that shows 80,100,110 can't be described using :interpolation.



I guess this feature is used so seldomly that it's no problem having a longer list and doesn't warrant having two different keys.