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

Scuppered by the post max length, here are answers, please hook up to the relevant points
We form opinions though experience and trying out stuff for ourselves. We evaluate new concepts against our experiences, if relevant.
The principle of least privilege is a common theory, typically represented in the implementation of an authorisation/permissions concept which is based on the premise that access is granted, not removed. Ignoring any technical limitations we then see 2 concepts being used and abused.
SAP_ALL analogy highlights the principle perfectly well. When you create an exclusion you are saying you can have everything except xxxxx.
This principle applies from the high level like SAP_ALL to the low level like excluding a field value.
Why do we not recommend removing a transaction from SAP_ALL? Generally because we know that there is likely to be a lot of stuff left in there which is not required. The same principle applies to excluding a field value. Anyone who works in SAP knows that there are always lots of superfluous field values.
As an example, someone asks for all plants except NNNN. Security admin builds a role containing * in Plant with en exclusion of NNNN. In 99% of cases that access would be granted for plant 0001, dummy plants, retired plants etc. Security is often an inherent control over data completeness & accuracy, in this case that control would be broken. The same applies for document types, some auth groups etc.
If we are to use the car analogy, deaths in cars have decreased massively. Why? because cars are far easier to drive and safeguards have been implemented (seat belts, crumple zones, air bags etc).
Flexibility is great but it comes at a price. A concept needs to be able to align with design principles & remain usable. There are lots of additional things I would like to see which you have also raised an interest in. Just not exclusions in my opinion
Edited by: Alex Ayers on Sep 29, 2009 1:33 PM

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<REMOVED BY MODERATOR>
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Not sure what this has to do with Database Connectivity?
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PFCG - Flexibility for entering Values

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