Limiting access to bank accounts in Bill Pay

It would be great to have more robust controls around which bank accounts an AP clerk has access to when they are processing bills.

We have two AP clerks. The first clerk is responsible for processing bills related to our large conferences. The second AP clerk handles all other bills for the organization. We have a conference checking account and an operating checking account. Our conference AP clerk continues to forget to select the conference checking when submitting bills for approval. It would be great to limit it her access to only the conference checking.