I've been trying to find a car dock or cradle (case compatible) for the One S that has a fixed USB port on it, so that I don't have to fumble with the cable. I can't find anything that looks like what I'm looking for, at least not for the One S...
These two cradles are actually for the One X, both of which have inserts that can be removed to accomodate a case:
iBolt: HTC One X iBolt Charging Car Dock fits w case Model IBPF-33306 NIB AT&T + Intrnl | eBay
Kidigi: Kidigi Car Mount Holder Stand Cradle Charger with Cover-mate for HTC One X | eBay
The One S is slightly smaller than the One X, so perhaps with the right case the One S may be able to fit in one of these? Does anybody know if this could work? Or am I just crazy?