Auction multiple items at once using a few different pricing schemes.
I used to use Igor's Mass Auction in WOW all the time.  I missed the functionality in WAR, so I made my own.

Pricing Schemes:
- Default
Initial bid and buyout are set to the default initial / buyout values.
- All Same price
If you leave the number of items empty, values are set for the entire stack.
Or enter a number, and the values are set for each # of items in the stack.
- Value Multiplier
Initial bids can be set a percentage of the vendor price. (Default initial bid if not checked)
Buyouts can be set as a percentage of the initial bid. (Default buyout if not checked)

Usage:
- Price Scheme: Select the pricing scheme addon you wish to use to get starting and buyout prices for.  Each scheme may have several options to choose from.  This scheme will be used when adding new items to MultiAuction; all items currently added to MultiAuction will not have their prices changed.
- Set All Prices:  This will attempt to set all items currently added to MultiAuction with the selected pricing scheme.  This is useful if you were adding items using another pricing scheme, and wish to change all item prices using another scheme.
- 8H / 24H / 48H / 72H:  This will set durations for all items to 8, 24, 48, or 72 hours respectively.

Notes:
- If a pricing scheme does not supply a starting or buyout price, the item will not be added.
- Once an item is added to MultiAuction with whatever price scheme you use, you can still manually change the starting and buyout prices.
- Can only add items from your backpack (Icon view only, list view not yet implemented)
- To add part of a stack of items - Split the stack into your backpack first and then add the stack to the auction
- You can alt+click items from your backpack to add them as well
- Checks for player bound items and will not add them.