Yes, Rick Priestly has advised me directly that the forced Acc re-roll is triggered by a sprint to contact regardless of the distance moved during the charge.
In addition, although p153 shows Harpies with rocks HtH and Drops as SV1, on p154 in the weapon summary shows rock as SV0 for both ranged and HtH weapons. P214 Olympian Harpies have the same SV1 stats as Beastmen Harpies but the weapon summary p215 shows rocks with SV1 for ranged and SV0 for HtH.
So, SV for Beastmen rocks is ?????