[EpicSounds]

Originally Posted by geraintluff

Here's a screen capture of me doing the edit by hand:
https://www.youtube.com/watch?v=S3AkC2iJMCY

so slow that way! Group your items!

drag to make time selection - run action "Item: Split items at time selection" (I use alt-s)

Then Script: X-Raym_Multiply selected items rate by X and adjust length.lua

for filling that gap I have a custom action assigned to a double-click modifier
https://reaperblog.net/2017/06/select-time-between/

you might also like this one

https://reaperblog.net/2017/03/area_select_actions/