There might be enough room for large thin 700c wheels.. either way get road slicks on it. That's pretty much the most important thing to having a commuter bike.

Otherwise, it just depends on what you like. If you can't lock the fork (don't know if it can), you could replace it with a solid one for a better ride.

A commuter bike is just a bike you get from point A to point B on... how you want to get there is entirely up to you.