The Delay next action item allows one to enter negative values. Although it would be nice if it allowed you to go back in time, it seems to me that this was probably not intentional as it would be nonsensical.
I didn't check the alpha version as I don't have time to mess around with an alpha version.
- Type of Mac: MacBook Pro
- macOS version: 11.3.1
- BetterTouchTool version: 3.562