DropScaleless is an option for FCLoopIsolate, ApartFF, FourDivergence and other functions. When set to True, all loop integrals that do not contain a FeynAmpDenominator, i.e. consist of only scalar products but no denominators, are set to zero.
FCLoopIsolate[SPD[l, q], {q}]\text{FCGV}(\text{LoopInt})(l\cdot q)
FCLoopIsolate[SPD[l, q], {q}, DropScaleless -> True]0