Bullrush only a portion of the distance?

[ericpants]

When performing a successful bullrush with an extra +20 over an opponents CMD, can I choose to push the opponent back a mere 10ft instead of the entire 25ft?

*This is not a question asking about my movement.*

[Barry Armstrong]

It would appear so. Beyond the original 5ft (which doesn't seem optional) I read the "can" as "You CAN move them more, but you don't have to."

PRD, Bull Rush wrote:

If your attack is successful, your target is pushed back 5 feet. For every 5 by which your attack exceeds your opponent's CMD you can push the target back an additional 5 feet.