Very true. Render the sequence and then pull #1,8,16,24, etc. This might be best because if a frame is smeared or jagged you could pull another good one near it. Pull only the best stills.
Drop all the stills into Photoshop, examine and then save the ones you want in a new number sequence. You could import that new number sequence if you liked as a clip. That would be your time-lapse. Loading each frame on the timeline would be your slide show.
JerryW