[whpalmer4]

You could create some nested contexts for the contexts that typically contain your "low-energy" actions. Then you file items in those "low-energy" contexts as appropriate. Items in a nested context show up in the enclosing level, so you don't really have to look elsewhere for your actions, but if you want to slap together a perspective that only shows things in the "low-energy" contexts it is easy to do and use.

@computer
learn how to use OmniGraffle 5
reorganize Aperture library
@computer : low-energy
read comics
read cycling news
read versiontracker

If I select the @computer context in the sidebar, I'll see a display like that shown above. If I instead select @computer : low-energy, I'll just see the stuff I probably shouldn't bother doing :-) Hopefully, it is obvious how to use this with more than one top-level context...