Right now it works like this:
when a word can be formed using the current letters, that word gets highlighted, and you can click it to get credits for it and this starts wheels spinning.
How i think it should work:
when a word can be formed using current letters, you automatically get credit for it (and words should be worth more i think!), and nothing happens. then you can choose to keep making new words by adjusting wheels, etc. and also add that for every 3 words you get within a spin you get an additional spin.