If zombies are close enough to smell you, they’re most likely also close enough to hear you. The main thing scent does is lead them to doors and/or windows. The range is much greater if you’re in the open, but then you’re in the open… so they can see you…
Oh yea, the other main time it comes up is when you try and sneak around at night, so there’s that.
The options I’ve been able to think of are either “take a bath”, by linking the wet condition with reducing scent strength, masking of some kind, basically a deoderant item or a smokebomb that doesn’t hurt you (normal smokebombs and all kinds of smoke fields do destroy scent, but are a pain to use), or a “red herring” item that smells like the player. Oh yea, NPCs should also produce scent, currently monsters ignore them <_<’