We do plan to include the same options for Item Searching from quick search in the Create Manual Order window. If you create the Order with the wrong qty/price, you should just have to delete the Order, edit the Item and re-create the Order from that Item again.
The inventory tracking is built in, and Orders can’t be created without them. I would suggest creating a template that you can use to create a quick item with default inventory, or keeping one Item around to duplicate for just this case.
John Manning, Senior Developer