Modify Table View to preferred fields

My original request would be to be able to modify the Customer and "Billable" fields from a table view. But ultimately, I think it would be more helpful if we could choose what the table field layout looked like for each client so that they don't have to click into each transactions to modify the most commonly modified field for their business. Two of my clients have a ton of billable expenses, and updating each one is timely (in super user mode).