Hello.
Yes I use Amla oil as a leave-in. I have noticed more defined wazes, THICKER hair, and a lot more shine. Here's my routine:
I use a conditioning shampoo (Mane N Tail),towel dry, spray a concotion of water mixed w/Infusium 23, and then I oil my scalp w/ the Amla Oil. For some reason this oil has a way of traveling all the way to my ends. I think it's because it's a rich oil.
I don't use anything else. This regimen has helped my hair become healthy. As far as the scent, I don't mind it. What could be used to mask the scent? Maybe a few drops of essential oil like peppermint or orange oil. These smell heavenly.
HTH