Why gnome-terminal does not allow unlimited scrolling

I am using Fedora 14. Gnome Terminal 2.32.0. But there is no box for "unlimited scrolling". In fact, the number of lines I can scroll back is capped at 10,000. If I set it any higher, it will reset to 10,000. Also, I went to gconf-editor, and found a key "/apps/gnome-terminal/profiles/Default/scrollback_unlimited". I toggled this value, but still I am limited to 10,000 lines of scrollback. I read online unlimited scrollback was introduced in Gnome Terminal 2.28. Is there some sort of system-wide or security conf entry that I am not aware of? If so I can talk to the sysadmins to get that changed.