If creating an app that schedules and posts onto twitter (like Hootsuite that people pay to use) can the status update limits be raised in some way? Is there a way to apply to twitter for that? Lets say 1000 users want to use our app, can the status update limits be raised in some way?
As far as I know these limits are on a per User and App basis, so you should be fine. This means for every user you will be able to post quite a lot tweets until getting rate limited.
Since the Tweet limit is a limit imposed on the User (even using an official Twitter App Users can hit this limit) I don’t think there is a way to raise this limit.