I find the weird thing though is if a post is to long you have to click it and move it with the arrows because there's no scrolly thing at the bottom of the page.  I was gonna suggest a simple fix but unfortunately the header div and the footer div are both located in the content div, and they don't like to stretch out of it, anyways, delete the overflow: auto; from content and that'll bring back the bottom bar. but when you scroll it will cause the header and the footer to move, and they won't stretch accordingly.

As for the footer... you just got to get rid of the 200px padding or whatever that was implemented in the div itself, but if you were to do that it'd effect every theme, so if you give that div a class then you'll be able to change it only withing this theme...

tl:dr; you got to fix some of the html in order to fix the theme.

each theme for phpbb has separate html, not sure about mybb though

ALSO regarding the number pages thing over on the left, if you want it to apear ontop of everything (cause when I scroll down to the footer it gets covered) add something like z-layer: 200; I think.