PFCG - Flexibility for entering Values

In the PFCG screen where we input the organization values for role restriction, I suppose the options available are not very flexible. Is there a reason for this? Is there a way in which we could change the layout? Could you suggest an Exit / Enhancement option for the need?

SAP currently provides the option of inserting new rows, which i feel is not very handy. It could be better and more flexible if we had the option to include/exclude single values and range like the laout we have for SE16 (the tabs Selcet Single Values; Select Ranges; Exclude Single values and Exclude ranges)

Any opinions / advice is welcome

regards,

Shekar