Die Roller — Fate
I see you dilemma, unless I'm missing something. It appears that setting up 4d3 + 2 in the selector window has absolutely no effect. Rigging the Roll by using a +2 there would only remove the two lowest results (-4 and -3) from the outcome pool, which is not the desired effect.
Likewise, specifying 1d3-2 four times in the manual selector does not give the opportunity to add anything to the overall result, even if a modifier is specified in the box at left.
Of course, adding 2 to the result is a "by inspection" computation, but that's likely to be no consolation.
The closest one could probably get would be: 4d3-6 ? It would take some experimentation to verify that, though.
(My reasoning: Addition is a commutative operation.
If R = 1d3-2 + 1d3-2 + 1d3-2 + 1d3-2
then R = 1d3 + (-2) + 1d3 + (-2) + 1d3 + (-2) + 1d3 + (-2)
a pro forma identity in this case, adding -2 is the same as subtracting +2
and R = 1d3 + 1d3 + 1d3 + 1d3 + 1d3 + (-2) + (-2) + (-2) + (-2)
by the commutative property of addition for real numbers...
and R = 4d3 + (-8)
by combining similar terms...
Adding the requested +2 would yield R = 4d3 - 6. Unless there is a problem with the parser in the die roller, this arithmetic should work.)