I didn't want to continue on a TWO YEAR old thread ... so ....
Currently, the only type of variable change allowed is addition. You can of course add a negative number to create subtraction, but this is obviously limited.
When you select the Variable Change option for a link, you will be presented the following change options for each variable: Add To, Subtract To, Multiply By, Divide By, Percent Of, Reset To, and Random
I think the + - / * % are self explanatory. Reset To will ignore whatever value the variable has and set it to whatever you put. This would be useful if you go to an inne that resets your health back to 100.
All changes except Random will be whole numbers (no decimals). Random changes will be in the form of "xDy".
For example, if you put in 3d6, this would take three six-sided dice and "roll them." You results would be anywhere from 3 to 18, with the most probably results being somewhere in the middle. 1d20 would be rolling a twenty-sided die one time, yielding 1 to 20, all with equal probability.