Sometime ago i wanted to have fun to fight ai on fists. I did the next: Created new items pack with only fists, gave it to suithurricane ai (get him as entity/grunt and provide analogic to archetype nanosuit params), increased attack range, FOV, reaction and something else in ai params. Change its behaviour to suithurricane too. After it i made fg which manage ai to ai/execute/sprint_combat to player (if player is in range more than say 2 m from ai) and stopped his running when in range less than 2 m. So way ai behaved himself as natural as he may behave himself according to default Crysis settings without changing any melee attack params of this character. He always runned to me by fg, stopped near me by fg and attacked cause of his character. More advanced scheme may be created using scripts editing or even game code, but i didnt do it with melee ever.