We have a 2007 Entourage and you cannot lock it with the car running. We installed a remote starter and it will not lock the doors when it is remotely started. Can this feature be disabled?

I think that this is to prevent you from locking your keys in the car with the engine running.
Some remote starters have a feature that when the car is running (and in park) you can hit the remote start button twice for one second each - then you can take the key out of the ignition and still have the car running.
At this point....if you would hit the 'lock' button on your door the doors would immediately unlock. However, if you get out of the car and close the door leaving it unlocked and then you hit the 'lock' on your original car remote the doors will lock and stay locked. So now the car is running the doors are locked and you have the keys in your hands. Then you can run into the store or house real quick with your car locked.
Once you come back, you hit 'unlock' on the original car remote. the doors will unlock - you can get it - and then before hitting the brake put the key in the ignition and turn it (dont crank it) as if you had when originally using the remote starter.
Maybe this will work for you.....