Hi Nicotinefit,
1) When creating your listings through Auctiva, you CAN place your items in your custom eBay store categories. First, click the "Ebay Settings" link under the "My Account" tab, and click the "Update Store Categories from eBay" link. Once you have done this, there will be 2 pull down menus on the Auctiva lister page, directly below the category field, from which you can choose up to 2 custom store categories for each item.
2) When you sign up for a Sellathon account through the Auctiva website, you are automatically enrolled in a free 30 day trial of ViewTracker, which is Sellathon's advanced tracking package. You can view this data by logging into your Sellathon account from the "Sellathon Setting" page under the "My Account" tab within your Auctiva account. Even if you decide not to renew ViewTracker, you will always be able to use the basic Sellathon counters for your Auctiva created listings.
-Mike