are AD support

idk...?

can you clarify the title a bit? are you asking if there are AD scaling support champions? champions that are AD but can support? the title is just a tad too vague.

Best AD support would be AD caster Jinx. I played it and it works, get Spellthief's Edge for the gold and true damage and just spam Zap and max it first, it does a lot of damage and not too hard to hit consistently with. Or if the lane goes bad, max Q first for easy Spellthief's Edge cash and damage with rockets. The Chompers are great too as cc and do DoT, making it use all Spellthief Edge charges nearly at once. And yes you do sell it later on.

Build I used in random order: Manamune - Guardian Angel - Lucidity boots - Essence Reaver - Ruby Sightstone - Last Whisper OR Ghostblade