Yes, it uses ability bonus d20+ability+skill die.
At the moment, it's just using the ability that is most common for each skill. I need to allow you to change the ability on the fly.
The ideal design would be one in which the player can select trained skill and then roll the die next to the appropriate ability score. The default ability for each skill would be selected and you could add any misc modifiers to the roll.
I still need to remove the Rank column. At the moment I've only managed to make it invisible. I also haven't figured out how to remove the "Rank" column header.
There is also the problem with how the rogue uses skill dice. I still have to give that some thought as well.