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.
Download
Because this is a property of Editable Poly and Edit Poly modifier, each Editable Poly/Edit Poly will remember the on.off status.
If you want to turn off all the time, you can use DefaultParamInterface or CustomDefaultParamManager or just run the following code to set off by default.
DefaultParamInterface.SetDefaultParamValue Editable_Poly "enableEnhancedHotkeyExtrude" false persistent:true DefaultParamInterface.SetDefaultParamValue Edit_Poly "enableEnhancedHotkeyExtrude" false persistent:true