I think page 42 is what it says: actions the rules don't cover. Perhaps you could have players pre-craft a special action that they could pull out when appropriate based on a particular check or checks but in reality, I think this would be the limit of what you could do. Skill challenges mapped on a prewritten module would hopefully be possible. Or again, you just use it to keep track of overall successes and failures with the DM selecting what a success or failure means from a list. I think the rules for skill challenges have been formalized enough that this would be possible. However, it is combat where a computer would excel ensuring speed and continuity while making sure the rules were applied perfectly.
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Actually you will find (particularly if you have played MTGO), that this is where the computer with a virtual table would really excel. In your example, the player who's turn it is receives priority meaning that the computer waits for them to input their action and selections necessary for that action. They select their power from a list, they then select one of the legal targets that the computer highlights on the VTT, and then they select from the legal highlighted spaces where the target is to be slid to if the rolling d20 says the attack was succcessful. All done 100% perfectly according to the rules. Maybe not the way how some want to play D&D, but if they had have had this up and running when 4e was initially released, things might have worked out more successfully for WotC.
In essence, I still maintain that the rules must have been built around catering to this sort of structure.