I tried to start playing Metal Gear V (came with my video card) with my standard keyboard/mouse mappings. I use the arrow keys under my left hand and the keys around them (Del, End, PgUP, and numlocked keypad), but this game won't allow hardly any of those mappings, and I can't use any of the seven extra buttons on my mouse in the keyboard/mouse mappings.
if MGSV only allowed re-mapping the keys around the arrow keys, and/or let me map more buttons on the mouse (I'm going to see if the Logitech SW allows for multiple standard mappings).
I prefer arrow keys to WASD too and honestly if you prefer K&M input, the best thing to do is constantly pester the developers until they add it in with a patch. Create a post on their own support forum complaining about "half working rebindings", give negative Steam & Metacritic reviews with the disclaimer you'll change them to a positive one "
once they've fixed the broken key rebindings", etc. It's the only language they understand and several developers have in the past improved K&M controls post launch upon receiving negative feedback of half-a**ed input code. It's incredibly sad we have to virtually beg for simple features that were bog standard on 1990's / 2000's games, but really just a reflection of the 'console first' attitude in general. Hell, even some 100kb 1990 DOS games had rebindable keys. 25 years of game "evolution" later and with +80,000x more RAM to play with, there's zero excuse for this PC port laziness. Developers have had more than enough time to learn & understand why rebindable options are necessary for many people (left vs right handers have different natural default finger placement, arrow keys just seem more natural to many, those with mild finger mobility restrictions (arthritis, etc), non QWERTY keyboard layouts (eg, AZERTY / Cyrillic) screw up hard coded "WASD", etc).
Well I got my controller (X-Box1), but what a learning curve! I can manage moving and looking/aiming but with thumb sticks instead of a mouse, I have to be very slow and deliberate, so when there's lots of action (soon into MGSV) I get killed rather quickly. I've played with the look speed (X,Y) and even though auto-aiming is turned on I have to very carefully aim to get an enemy.
Humans in general have always had more rapid precise fine motor control in the wrists than via thumbs alone. It's why in fast paced FPS games, "wrist flicks" (mouse) are faster at precise aiming than thumb-scrolling (controllers) especially when
console cheat mode auto-aim is disabled. If a controller is your only option or preference, you can always improve via practice / repetition / habituation but even then if you really want to use a K&M and a game doesn't support it that well, let the developers know. When enough people complain about an issue, they do occasionally listen to us lowly PC peasants...