Kraken: support spot with margin trading

Hi,

kraken and most other exchanges allow you to use margin for the spot market.
This for example allows you to short without needing to have the actual crypto currency available in the account.

Seems like this is a basic platform feature that is missing. Futures already support leverage, but I want to keep trading on the spot market.

In case you are using the kraken REST api. This is just about filling in the leverage property of the AddOrder request.

Would it be possible to add this feature for kraken?