since alt seems pretty busy, how about ctrl or maj+alt + two letters (ctrl-X-M ; ctri-X-D; ...) ?
a printout of the list is not only useful as a reference when you have just set them, but also a good help to define them in a way that is logical to you and will therefore help remembering them
this is also good to remember shortcuts by grouping them: ex: order thought by name ctrl-O-N, order thought by type ctrl-O-T, order thought by date ctrl-O-D, etc ...
(this typically happens if you take some thoughts out of a brain to create a new one. you then forget these thoughts in the original brain. if at some point you want to reintegrate into the original brain, those thoughts that have been modified in a new brain, you are better off deleting these thoughts you took out and forgot in the original brain, before pasting the new version)
I think it would make more sens if PB was reactivating thoughts that are copied with a non forgotten status.
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