0.9.7 is sitting here on my netbook -- I have to test just a few more things before releasing. I sincerely apologize to those of you who've been waiting for 0.9.7 features -- I'm in the middle of quitting my job, though, so I can work on WP Development full time -- maybe that will help!
Moxie, in the standard version in 0.9.7 you can set ONE default time, which would do something like "Add 6 months to the publish date, and that will be the expiration date." However, the ability to have multiple such defaults will be in the Pro version only.
(Pro version basically takes all the stuff you see in Content Scheduler options screen and packs it into a "Profile." You can have as many profiles as you want. When you tell a post / page / custom content to expire, you tell it to follow whatever settings are in a specific profile. So, each profile could have its own default expiration, to meet your needs.)