Thanks for the advice. I did know of the genuine firmware update which is on the same page as some of their software for other mods they have which allows you to change settings. Does the custom tweak update you speak of still allow 200w, Do you happen to know the name of his custom update as I can't see anything obvious labelled cuboid firmware or something like that.The joyetech cuboid download site will allow you to upgrade the firmware to the newest version:
http://www.joyetech.com/mvr-software/?sid=171
This guy has created some cool tweaks to the screen changing the font and some of the symbols:
https://drive.google.com/folderview?id=0B4ffTVA88KbAOHVfSDlJRjdiZWs&usp=drive_web
There is no actual program such as DNA200 escribe that allows you to adjust the settings from your PC.