I noticed there wasn't anywhere to input my own selections for Primary/Secondary DNS Servers.  Here's a pic of the basic Router Settings page to show you what I'm talking about:

Tonight, I went onto my router to see if unchecking "Enable DNS Relay" on that page would help with my router slowdown/lockup issues (1.21NA firmware related).  As I watched the page load, I noticed that the were 3 blocks that painted as the HTML loaded and then promptly disappeared.  It's not that they weren't there, they seem to be being hidden upon load.
Example:

I'm able to get the Default Gateway, Primary & Secondary DNS blocks to show by hitting STOP on my browser before they hide.  However, even if I do change anything within these boxes, the firmware thinks nothing has changed, and doesn't commit the changes.
Example:

And if I say "Save anyway" the changes have no effect.