If you want to pay the .10, Ebay does, in fact, let you space out your auctions however you'd like. What I do (when I use the feature, which is rare now) is tell AW2K to upload them all at once for a future scheduled time. Then I go to My Ebay and select all the pending auctions for time edit. It's at this point that you can set a start time and a spacer. It's one of the few things Ebay made that's efficiently edited :)
For what it's worth, when I know I'll be out of town, I pay the .10/auction and setup for the whole time I'm gone. For 4 or 5 days, thats about 80 auctions, or about $8.00. Not bad for peace of mind AND you don't have to worry about computer crashes, blackouts, or some huge storm killing your pc. I'm so paranoid when I am out of town I would never feel good about letting my pc do the work - not nearly as reliable as the Ebay method.
Hope that helps!