Setup for Freight Account

Summary:

We are looking to accommodate multiple freight accounting scenarios to streamline accounting for freight. We have the following three criteria and are looking for feedback on ways to satisfy all requirements.

1. User wants to prorate the freight cost to the cost centers in case of Inventory purchase order line to particular Cost Center - We are handling this with Alternate Account approach from Manage Account Combinations
2. User would also like to account for freight related to expense items to a another cost center - We are handling this with Prorate Across all Items tick box at payables invoice
3. The team would also like to fully prorate freight expense if invoice lines are capital related. Here, they want that the freight should charge to the same account which has been used for distribution line. How can we achieve this 3rd requirement?