This isnt just Razer's issue I havent seen a mouse with that functionality specified (and a few logitech I tried have the same issue at least they have a 3rd main button used as a shift to have double the keybinds on your side buttons in nagas you have to assign the scroll wheel or something like that)
like as an mmo player assigning keyboard buttons to the side buttons is defeating the purpose of having side buttons because I use my keyboard buttons if I didnt want more buttons than my keyboards ones I wouldn't be looking for a mouse that has 12 side buttons would I?
why should be the naga's sidebuttons be either 12345 etc or numlock 1234 or ABCD etc these all are keyboard buttons and I already use them