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I managed to get the POWER/LOGARITHMIC options to work with AVG(SALES) vs AVG(DISCOUNT) with CITY on color (from the Superstore data set). Also, continuous MONTH(Order Date) seems to work in the version without year:
Unfortunately, I don't know why it doesn't work for the date with year..
I, too, was able to add the POWER TREND line to a scatter plot, but still don't get the option when I construct the worksheet I described earlier.
I'll chalk this up as a win, with a note that it seems to apply to scatter plots only.
Thanks for the feedback!