TwilightZero

A few days ago, I purchased an Atari 7800 from a yard sale. I figure I got a decent deal, as I got 15 7800 games and 12 2600 games with it, and it only cost me $5. At first, I couldn't get the system to work, but after a day and a half of attacking wires and swearing loudly, I found out that it was the ancient switchbox that had come with the system that needed replaced, and all is well with that. However, while attempting to figure out if I was doing something wrong with setting up the system that it didn't work, I came across this charming site, and started looking around the forums, and somewhere along the line, I believe I saw one thread talking about modding a 7800. This leads me to ask the questions of: What kind of mods can be applied to the Atari 7800, and what do they do? Are they even useful, or better left forgotten to the casual gamer? I apologize in advance if I'm either coming off like a rambling idiot or asking stupid questions.