1. there probably was a lot of safari changes. and in addition to that, i think it relied on sandcastle which basically was a dependency for looking up locations or something, which has not been updated for iOS 7 (as far as i know)
2. probably takes a lot of work considering a lot of UI elements have been changed
3. try contacting the developer
i don't think there ever was. custom fonts were via bytafont (bytafont 2 for iOS 7)
Still really hoping for an update to Music Controls Pro
It was one of the more expensive jailbreak tweaks, so it's kind of frustrating to see that the dev has been busily putting out new stuff while seemingly having abandoned the stuff for which he already has our money