[pzhon]

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Assume that I'd be happy (though bored) to just sit there and take my small amount of free cash, with no variance to speak of. Question--when, if ever, should I voluntarily put money in the pot?

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If you are well-bankrolled, you should play no differently than if you were receiving no bonus at all.

If you are under-bankrolled, you may avoid making some marginal plays. While these might ordinarily decrease your win rate from +1 BB/100 to -1 BB/100, you might be more interested in the decreased variance if the bonus means your win rate would only fall from +11 BB/100 to +9 BB/100. Be careful that you need to have a sound understanding of poker theory in order to identify the marginal decisions accurately. Often, people confuse plays they are comfortable making with those that are right by a lot. If you give up the plays you are not comfortable making, you may be giving up a lot of EV without saving much variance.