Fine Tuning a Linksys Wireless Access Point

Does anyone know about any good reference points for the forty bazillion settings you can make on the Linksys BEFW11S4 v.2??

The documentation leaves a lot to be desired. One example is the antenna selection where the choices are default, left spread, right spread and diversity spread. The docs only say, "This selection is for choosing which antenna transmits data." Hokay, so the difference between default and diversity is ... eh, what?

There are dozens of other settings that aren't documented that well either.

Can anyone point me in a better direction to better understand things like RTS and fragmentation settings and the other terms?

Thanks,
Tom