[Tutorial] How to add buildings to epoch without editing mission.sqm

[rvg?!]

It clearly says:

Syntax:
    unit addAction [title, script, arguments, priority, showWindow, hideOnUse, shortcut, condition,(optional arguments) positionInModel, radius, radiusView, showIn3D, available, textDefault, textToolTip] 

so what you need is:

Syntax:
    unit addAction [title, script, arguments, priority, showWindow, hideOnUse, shortcut, condition]

Why not follow the Bi info? The condition is nothing more than "WaitUntil".

Syntax:
    unit addAction ["foo","[]execvm foobar.sqf/[]call foobar_fnc", "", 2, true, true, "", condition];

Now you just set the condition and define your coursortarget with "typeof cursortarget".