I thought it's actually just still 60% chance regardless of how many regular abilities the Pokemon can have. Just a matter of luck, really. At least it's not like anorith or eevee which have a 1/8 chance to be female (tentacool is 1/2 I think?).
(Side note but dw abilities don't pass on if you're breeding with ditto, jsyk).
Idk.. stickies are more for the most active/important threads and I don't see it geting much useage. Furthermore, one can also rng for non-fourth gen games so it wouldn't make sense to have a separate question sticky for only one gen, nor to have a question thread and a second one for only one aspect of the games that the average player wouldn't use anyway.