Smart Extrude is awesome. But, I know sometimes you want to be not so smart.
Good news. There is a maxscript property which you can turn on/off “Smart”.
Editable_Poly and Edit_Poly has #enableEnhancedHotkeyExtrude property, and as you expect, it turns Smart Extrude on/off.
For your convenience, I made a simple macroscript. Unzip and drag and drop to a viewport. Since it is a macroscript, you can make button or assign to a hotkey or add to the quad menu and etc.
Because this is a property of Editable Poly and Edit Poly modifier, each Editable Poly/Edit Poly will remember the on.off status.
DefaultParamInterface.SetDefaultParamValue Editable_Poly "enableEnhancedHotkeyExtrude" false persistent:true DefaultParamInterface.SetDefaultParamValue Edit_Poly "enableEnhancedHotkeyExtrude" false persistent:true