Here is the Edited MAT.ini that allow you to Open Console At MAT
Just copy and replace it at your backup MAT
Video As example
Press INSERT button to Open console.
Some example code from @epan96
rend blend
rend bone
rend skin
rend bound
rend reset
switchteam
behindview 0
behindview 1
reconnect
Disconnect
Editobj [weapon name]