This uses the Date and Time settings on your iPod Touch. It makes your upgrades end immediately, your blacksmith full and your potions done. It is a bit sketchy and sometimes doesn't work though.
It goes like this
No apps open> Open Settings> Wifi Toggle OFF> Settings> General> Date and Time> Set Auto Toggle OFF> Set a few hours latter> Exit app> Open Knight Storm> Go to Castle> Your stuff should be full and if you try to click it should say "Time has been disrupted, Need Internet" > Go to Multitask (Double Click Home)> Settings> Wifi Toggle on> IMMEDIATELY AFTER YOU TOGGLE WIFI ON GO TO MULTITASK AND OPEN KNIGHT STORM (YOU NEED TO BE QUICK)> You should then be able to harvest everything.
The first time I did this my upgrades and taxes were done, the following times only potions and sometimes only blacksmith and XP. It usually says "logging into server" after you go back to castle. Sometime you need to delete the app from Multitask to redo this.