when I created my spread formation I added in a step in ISBoxer to turn strobe off. Look at some of the preconfigured macro's to get an idea of how to do that. So in keymaps create an action or macro set the first action to the jamba strobe off slash command then add a second step and make that the strafe.

Also I never use the white or black list just create a passable keymap. Take a look at the dps keymaps and just copy one and change the bindings. So take say DPS keymap 1 make a copy. Change the name and the two binds to what ever you want. Easy donuts.