There's one other non-obvious bonus to the DD-WRT firmware on the WNDR3300 - it disables the blue disco dome lights.
Ha, Ha, I forgot to mention those annoying blinking blue lights. That was another reason I didn't like the router I could not find any way to turn them off.
If you upgraded the router to the new version of the Netgear firmware then shutting them off was easily accomplished by pressing the dome - it functions as a switch. From what I've read in the DD-WRT forum, the control of those lights would require a custom script to function in DD-WRT as they do in the OF. Supposedly they light to illustrate which of the internal antennas is active in realtime.