Captcha / reCaptcha / Anti-Bot Question
 

Is there anyway to add an anti-bot question or the recaptcha system to the registration page? I don't fancy multiple bots registering as I had this happen to me in the past.

Even just a simple question script for humans to answer would be sufficient.

Yes, it's possible.
You can use reCaptcha if you want, just follow any installation instructions and edit the register.php

I know that Quillik from Arvyre managed to do it somehow... but I can't remember what files had to be edited. This was also on the old version before the new name.

In this same vein, how difficult would it be to code something like a certain forum mod I have for registration on my site, where you have to make the images look vertical (I have hardly had ANY registration spam since I installed it)

http://aaa.lasolistia.com/forum/index.php (go to register and you'll see it)

If you're looking for something quick and effective I'd say go with Google ReCaptcha.
http://www.google.com/recaptcha

Sorry for the double post, but I reread the OP's question again and I would like to also suggest to Lone Wolf that they add the ReCaptcha system to the log in page as well. This will up your security a bit and prevent some attacks that could occur there.