I'll vouch for running Tomato. I wouldn't want to support anyone's Linksys router without it. But the settings should be able to sit at defaults mostly, especially radio power. With that router and a MacBook I didn't find any issues with signal reception around the house.

Speaking of picking up others' signals... I can pick up 44 wireless networks from my house. I need to walk around the full perimeter of the top floor to get them, but I was quite surprised nonetheless. I listed them with a snooping program as they won't all show up in the OS' own WiFi menu.