I already wrote the code and used the values 0..5. I don't want to be real restrictive in the values that I allow. I just don't want to allow crazy values that might cause problems. I wrote it as a regular input, where you just enter it on a keyboard, but I'm thinking that I might change it to a selector where you select 1 of 6 values. That way I can put short comments beside each value. Getting the range right isn't a big deal, because this is something that can be easily changed in the future.