If you don't want to keep going back to this page, you could try adding them to your buddy list and it will pay off.

The pain of being able to add only 2 usernames at a time will be eased by the fact that you only need to add them once and when you click on Send PM to buddies, you can send your message to multiple (Max: 5) GpW members, which means you save time.

Proof:

If you want to send a mass message to all other 18 members of GpW on the JCF, you won't have to send it 18 times, you only send it 4 times. How is it done? You check the appropriate boxes beside the usernames you added to your list then send it and repeat that process 4 times.

The private message system may not be as good as ICQ or external applications but is a very good thing to have for those who only have net browser access.