Project logical editor: Adding Frames

I need to pull out the head and tail of a selection of events in a project.
I’ve managed to use the logical editor to successfully add 1 frame to the end of each clip (I’ve checked that the added frame has audio from each clip its added to) but I can’t figure out how to add to the front of clips.
The selection is foley and a lot of the clips are spaced out so adding a frame won’t cause issues. I’ve tried selecting all and manually pulling with the mouse but some clips are playing from the very beginning and stop the others, that do have audio before they play, from being extended.
Is there a way to do that or will I have to find which clips play from their origin and leave them out of the selection?