After reading of many sites submitted more than two years ago and not yet listed, I am wondering if there's any way that we can contact the editor to help expedite the process.
Theres no way at all unfortunately. DMOZ makes it deliberately difficult Have you actually submitted a site and not been listed?
You can contact him via send to...editors name in the cat you are interest in. Doubt if he/she will read this. Doubt if he/she will answer to this. Doubt if he/she will expedite the process. Probably this editor will feel uncomfortable because of this an will not expedite this process. Sincere advice - dont write editors about this.