I came across this third party app in Codeplex – Exchange 2010 RBAC Manager.
RBAC Manager puts all efforts to simplify the RBAC administration. It provides the missing GUI to edit RBAC settings on Exchange 2010 systems; including adding/removing cmdlets, cmdlet properties, assignments etc. The tool is written in C# and uses PowerShell behind the scenes.
You need to have Exchange 2010 Management Tools installed prior to running RBAC GUI.
Do test the tool in your lab before deploying in production systems. Download the tool here