Use n instead of Fn for choosing the OS when booting?

[Wu, Yue]

Hi, list,

Freebsd uses Fn to choose Nth OS on the disk, I have installed FreeBSD on the
second slice of disk, so I use F2 to choose it, but sometimes I hit F2
occasionally before the boot menu is up, and F2 is my notebook for entering
the setup menu, so I go into BIOS setup menu, it's annoying me sometimes, so
I think why not use number key(0~9) instead of F1~F12 for choosing OS?

-- 
Hi,
Wu, Yue