I think you've already had your question answered in #scripts, but yeah. You can do it while playing, but as soon as the replay starts all environment objects lose their force information.

testcode.lua
For all you folk curious about scripts. Now you don't have to create .lua files and then load them to see what happens, simply type /eval <code> in chat and observe what happens.


List of outdated commands I sometimes use:
1
2

theme_picker.lua
One of the more commonly requested scripts is a custom color theme for the menu. Rather than making a new one for each color scheme, here's a script that adjusts most color values with sliders.


Comet also recommended I link this thread here so that people have an easier time picking a theme:
[Game] Complete list of toribash color codes and their respective RGB values