Manager Self Service Customizating Transactions

We are looking at deploying Manager Self Service.  Several of the transactions do not apply to our organization and others we need to add fields or remove fields.  Has anyone had any experience with adding custom fields to the Manager Self Service transactions?   We have tried to customize but we cannot see the fields we have added to the custom page on the field selector.

Also how do you add custom transactions to the list?

If you have any advice on how to customize the transactions, we would appreciate the help.