Is it possible to modify project settings (mouse movement delay) from a script?

Hi,

tristaanogre is right.

You can use LLPlayer method:

LLPlayer.MouseMove(X, Y, Delay)

Doc:

https://support.smartbear.com/testcomplete/docs/reference/project-objects/items/llp/llplayer/mousemove.html

To modify Delay for one specific test use TestComplete onStartTest and onStopTest events.

Set the parameter you will read in the event and change this parameter only for this one test. If, of course, you are using LLPlayer in more tests.