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Ken: I really hope that you don't believe that parallel action groups are any kind of substitute for real sub projects. .)

Now, back to topic.
The main need for putting individual actions to on-hold is with single actions.
SAL's are kind of a silly construct in my opinion. They don't bring anything new to the table compared to projects. You could just as well create a project and call it fitness, make it parallel etc. Hmm, off topic again.
If you follow jonwalthour's/GTD's idea of being very liberal with what you consider a project, you are going to end up with a lot of projects. This creates the need to organize those projects in some kind of structure and currently folders don't allow that because they can only be dropped (which I like). So we are back to the need for sub projects again!

Omni, come on throw me a bone here...