How can I insert a space between several clips in Premiere?
I believe I figured out a workaround to do this (based on the idea of using the speed duration from putting a gap between each clip)


Drag and drop all 20+ clips on to the timeline to add them.
Select on the clips and copy them onto a new audio track
Select all the new clips you just copied and right click and choose Speed/Duration.  Choose a setting like 50% and check Ripple Edit, Shifting Trailing Clips
Delete the clips on the new track you just copied and time stretched, leaving you with just the original clips.


The original clips should now be spaced out.  Obviously could be problematic if you have lots of other stuff on your timeline but you could lock those tracks.