I too would like to see this feature being provided. This would be a great bonus for sellers to have.
If customisations are done to put this in place does that mean every time an update comes out there'll be problems?
We are working on such kind of feature. Seller can add tab with their terms and condition, reviews, achievement and also there will be a filter because if anyone need more tab then they will be able to get that. I think that will meet with your needs.