InfoPath Dev

I use a form library for my infopath 2007 forms, i have now a list with about 1000 forms. My issue is now that some user doublick on a form and this way make a check out. Is it possible to close down the check in/out on a existing form library? this way a user will not be able to make a checkout?

You could move the form to a separate form library. You could also write code to not allow checkout. Two options ... I'm sure there are more ...