Edit your fpi in languagebank\english\gamebank\GAMEFOLDER. You will need to edit the lines for load and save game. For example, to remove save and load from gameplay, do something like the following:
setuplevel.fpi
; Setup Game Menu
:state=0:hudreset,hudx=50,hudy=10,hudimage=languagebank\english\gamecore\backdrops\basic\gamemenu.tga,hudname=gamemenutitle,hudhide=1,hudmake=display
;:state=0:hudreset,hudx=50,hudy=40,hudimage=languagebank\english\gamecore\backdrops\basic\loadgame.tga,hudtype=2,hudname=loadgame,hudhide=1,hudmake=button
;:state=0:hudreset,hudx=50,hudy=50,hudimage=languagebank\english\gamecore\backdrops\basic\savegame.tga,hudtype=3,hudname=savegame,hudhide=1,hudmake=button
:state=0:hudreset,hudx=50,hudy=60,hudimage=languagebank\english\gamecore\backdrops\basic\exitgame.tga,hudtype=5,hudname=quitgame,hudhide=1,hudmake=button
;:state=0:hudreset,hudx=50,hudy=50,hudimage=languagebank\english\gamecore\backdrops\basic\saving.tga,hudname=savingprompt,hudhide=1,hudmake=display
:state=0:hudreset,hudx=50,hudy=70,hudimage=languagebank\english\gamecore\backdrops\basic\returntogame.tga,hudtype=4,hudname=returngame,hudhide=1,hudmake=button
:state=0:hudreset,hudx=50,hudy=50,hudimage=gamecore\huds\pointer.tga,hudname=pointer,hudhide=1,hudmake=pointer
:state=0:state=1
; Main Game
:state=1,escapekeypressed=1:pausegame,state=2
:state=1,scancodekeypressed=197:pausegame,state=11
;:state=1,scancodekeypressed=64:hudshow=savingprompt,quicksavegame,pausegame,state=21
;:state=1,scancodekeypressed=67:quickloadgame,state=31
:state=11,scancodekeypressed=0:state=12
:state=12,scancodekeypressed=197:resumegame,state=13
:state=13,scancodekeypressed=0:state=1
;:state=21,scancodekeypressed=0:hudunshow=savingprompt,resumegame,state=1
:state=31,scancodekeypressed=0:state=1
; Game Menu
:state=2,escapekeypressed=0:state=3
:state=3:hudshow=gamemenutitle,hudshow=quitgame,hudshow=returngame,hudshow=pointer,state=4
;:state=4,hudselectionmade=2:loadgame
;:state=4,hudselectionmade=3:savegame,state=6
:state=4,hudselectionmade=5:continuegame,destroy
:state=4,hudselectionmade=4:state=6
:state=4,escapekeypressed=1:state=5
:state=5,escapekeypressed=0:state=6
:state=6:hudunshow=gamemenutitle,hudunshow=quitgame,hudunshow=returngame,hudunshow=pointer,resumegame,state=1
Commenting out the lines that refer to load/save, and removing the hudshow/hudunshow for load/save, is what you can do to rmove the option.
Quote: "There will still be hot keys available though... F6 and F7 or something."
Hotkeys are defined in the setuplevel.fpi. You can disable those too, just as I outlined. Unless that has changed in v1.19 from v1.17.

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