How about present the rules, Star Wars style? Like in a marquee so they can't fake-scroll.

Lol. I personally don't have much coding knowledge, so I would prefer if we kept it as less complicated as possible.

Yeah, but unfortunately there's no easy way to force people to read them. The best easy way is to make sure the rules are visible enough, like bolt text, and that no scrolling is needed to get to the agree box, so by that time they can maybe take a small look. Sadly not everyone is gonna read rules no matter what.

IMPORTANT!  Failure to read these rules could result in potential banning from Omnimaga either temporarily or permanently.  Please take the time to read these rules.

I believe DJ_O has the right idea. Usability studies suggest that most people don't enjoy reading much, particularly on the web—if it's not concise enough, people tend to miss it entirely.

Personally I think shorter rules would solve most problems. They might end up being sounding less serious (I mean on big sites there are like 8 pages of rules most of the time) but at least they would be understood by more people. We may have a moderately big site (not big like SMF, which gets 1200 posts a day, but not medium like the old MaxCoderz board, which had about 150 a day), but regardless of our size, we're still a calculator site, mostly frequented by high school students with limited internet access, and most people don't want to read through 40 lines of rules.

I like that idea. Make it short and concise (ten lines or less, if possible) and people will actually read them.

IDEA IDEA!
(Well, two.)

1) I take this idea from Virtualbox Non-OSE, in which they forced you to read the license agreement by making you scroll ALL the way down before enabling the "Accept" button. This assumes that the ToS is inside a mini text box (or a scrollable DIV). However, some may know the trick, so an additional thing to tack on is a time limit, as well as a scroll rate detection. This depends on Javascript though, which leads me to the next idea:

2) Reading captchas! Basically, there's an image containing text hidden somewhere in the page. I got this idea from a free web host that really wanted its users to read the ToS, and hid an image somewhere. It's really random, but it's very effective as well. Basically, when the user searches for the image, they are pretty much forced to read it as well.

Personally, I would implement #2 or both, since #2 doesn't depend on Javascript. For my choice of both, I say that because using Omnimaga sans Javascript != good experience, so you might as well do both.