When using Review mode, the only options for showing actions are Remaining and All. Is there any way to limit the actions to available (thus not showing deferred actions)?
I would recommend creating a perspective for that purpose. According to my read of GTD, you should be looking at upcoming (deferred) tasks while conducting a Review.
One method (in line with GTD in my view) is to use the Calendar to defer items, making another review possibly redundant. But a perspective does the job.