RTC4.0: store enumeration in database: how does that work?

RTC4.0 has new enumeration properties added when creating a new enumeration attribute.

http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0/index.jsp?topic=%2Fcom.ibm.team.workitem.doc%2Ftopics%2Ft_defining_priorities_severities.html

The 2nd step says:

Select the enumeration that you want to edit, or click Add in the Choose the Enumeration to edit field to define a new enumeration. After the enumeration is selected, in the Enumeration section, click Add to add a literal to the enumeration.

1. Note: When you define a new enumeration, you can store it in the process specification or the database. If you store the enumeration in the database, you can add new values to the enumeration directly from the work item editor, even if you do not have permissions to modify the process specification. You still require permissions to add new values.

I created a Scrum project area and add a user with Scrum Master role(default), I notice that by default, in project configuration permission's Process > Modify a process > Modify the process specification permission is checked.
If I create a new enumeration and select database as store option, I have no problem to add new literals and when adding new attribute and select the new enumeration and then add presentation to the task WI, I can see
the new custom attribute is there with the newly added enumeration list.

1) Does that mean that if I have Modify the process specification permission, I don't need specific permissions to add new values if I select database as store option? I can see that under team configuration > scrum master role will have a new permission "Save enumeration" > Create new enumeration value, but it is unchecked by default and I did not check it when testing.

2) According the help:,
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If you store the enumeration in the database, you can add new values to the enumeration directly from the work item editor, even if you do not have permissions to modify the process specification. You still require permissions to add new values.
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I added both "Modify the process specification and add new enumeration values " permission and then tried to create the work item with the newly added enumeration stored in database, I am not able to add any new value in Workitem editor.
What does "you can add new values to the enumeration directly from the work item editor" mean? isn't that the tool would allow us to add the new enumeration value in task(for example) workitem when it is created or edited so long as the new enumeration type attribute is added and the mentioned permissions are allocated?
How does that work if my understanding is wrong?

Appreciate if there is any inputs. Thanks a lot.