I am making the assumption that you want to move the packages/components out of the project folders(correct me if i'm wrong ). You can place your components anywhere you wish. To refer to them in any project you go into project properties build path and add the folder of your components into the source path option. I find it easier to move things around outside of flashbuilder then go into it add the paths and do a clean build of the project.
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I did misunderstand you...
I don't believe what you want to do is possible, it would be nice to have a customisable component panel, maybe an enhancement request is in order.
Thanks at least I know noe that its can't be