It would be nice to render the visual previews of only a part of the total sequence.
For instance I have a timelapse of 1000+ photos and after deflickering the first 70% looks good, but the last 30% needs even more deflickering and it's nice to work and make preview of the last 30% of the sequence. That would save a lot of rendertime!

This will be possible with the next upgrade!

Possible with LRTimelapse 5: https://lrtimelapse.com/news/lrtimelapse-5-new/