As you think, I suppose that operations which you can perform on RaQuest are also possible by Enterprise Architect.

Therefore, it is not impossible to use RaQuest as the tool which you can extract the features related to requirement of EA and see in the format of a list, a tree, a matrix, etc.

However some things are only operable on RaQuest.
For examples;

• state transition of requirement
• Grant of automatic review flag by change of requirement
• Autosave of the update history of requirement
• The package as a child element of requirement
• Automatic grant of requirement ID for every package
• Counting the number of status of requirement
• trash
• Calculate requirement priority value
• and so on.

Operation is easy because it is the tool considered focusing on requirements management.

I would like you to refer to RaQuest Features Guide, which can be downloaded from the following URL, for the details of features.
http://www.raquest.com/downloads/RaQuestGuideEn.pdf

Moreover, the evaluation version is downloadable from the following URL. Please download it to try if it is suitable tool for your requirements management process.
http://www.raquest.com/products/raq_downloads.htm