[bigdaddy424]

https://github.com/alliedmodders/amx...wmenus.cpp#L94 see `m_ItemColor`
you have to recompile the source

Edit:
apparently youre able to change the number color
https://github.com/alliedmodders/amx...enus.cpp#L1103
https://github.com/alliedmodders/amx...newmenus.h#L32

#include <amxmodx>

const MPROP_SET_NUMBER_COLOR = 10

public plugin_init()
    register_clcmd("say f", "clcmd_f")

public clcmd_f(id)
{
    new menu = menu_create("menu", "menu_handler")
    menu_additem(menu, "item 1")
    menu_additem(menu, "item 2")
    menu_additem(menu, "item 3")
    menu_setprop(menu, MPROP_SET_NUMBER_COLOR, "\w")
    menu_display(id, menu)
}

public menu_handler(id, menu)
    menu_destroy(menu)