Since the SFV checker works rather badly, I often find myself doing it, and it's efficient enough for my tastes. It produces a listing of only incomplete dirs, that's all I ask.
Anyway it's always better to have choice, so if enough people vote for this one, let's do it ! Though I think it'd be better if ftprush could filter incomplete directories similarly to the compare feature, what do you think ?
PS: I'm not in favor of adding features to a software until it's too bloated to use. (in fact for this specific software I'd rather have bugs fixed than features added :p)