If you use Keyclone you can also Add WSAD to the do-not-pass list

so only 1 WoW will notice if you use those keys.

I personally use the do-nott-pass option. And i mostly use 1 hand on the mouse and 1 hand on the keyboard. Cause i like to walk with my mouse. gives me a better overview. but i think im one of the few that use a mouse in Dual boxing.

I would also suggest new players to use 2 hands on the Keyboard, so all the Keybinds are near. and spamable :P
But at the start 1-20 you wont need that many buttons if you dont use that many classes