Aussie, you have right timing. DIMM ram for desktop have low latency. But manufacturers start ther SO-DIMM production with normal timing RAM (i mean 3 and 4). Low latency will be produced in a near future but it's not sure ...
Don't...
I'm not sure that you can change it in the bios ... Bios shipped with notebook are generally less tweakable than bios desktop. Maybe with a hack but i didn't hear anything about it.