Is it possible to restrict Act as proxy manager feature completely.

We have built a custom solution for our clients where in the increment and bonus plans worksheet for all the eligible employees goes to CEO for approval, But before that the compensation manager acts as proxy manager and submits the worksheets on behalf of different line managers (Chief of units). Once CEO receives the approval notification he approves and the transfer cycle is run.

Now our client wants that no one should be able to Act as proxy for different Line managers not even compensation managers and without using the Act as proxy feature our compensation manager can not submit the worksheet and no approval notification will be triggered.