Hi Lauren - we're getting ready to deploy SI and we have this same problem. What I'm going to test out is as part of the training telling our team to create a custom view for each tab, where filter = Account Manager (their name) or Inside Sales Rep (their name) - filters aligning to the fields we have on each account that puls from the Account Team object. A little annoying we have to train sales people on creating and using views in Salesforce.com - since we all know how sales people are. But, this seems like the only option since we can't modify the global setting