Sorry, I realised I did not give enough detail. Here the \AMCnumericChoices is used, where the student has to cross the number corresponding to the correct answer. Is it possible to give partial credit for an incorrect sign but correct magnitude for a numeric answer?

\begin{questionmultx}{abs}
\scoring{formula=(Vdifference== 0 ? 2 : Vdifference== 2*abs(intV) ? 1 : 0)}    
    \AMCnumericChoices{-5}{digits=1,sign=true,scoring=false}
\end{questionmultx}

Documentation : https://www.auto-multiple-choice.net/doc/latex/ -> Access to values