Properties for auction

We do a lot of auction sales and I would like to see three things added to accommodate this form of listing which this module currently doesn't do.
1. Create a listing category of "Auction".
2. Auctions also do not have a price so the price field would need to either be hidden for this listing category or allow the word auction to be written into the field.
3. Two new fields, the first for the date of the auction and the second for the venue of the auction.

Thanks