Hi! Thanks for playing :)
48K Spectrum cursor keys (5/6/7/8/0) are one of the alternate direction control key sets, which just so happens to map exactly to the Cursor Joystick standard :)
You may just have to set a Next joystick port to be Cursor.
However, combat and menus are still completely keyboard driven.
If you don't like W/A/S/D/E, you can also use the "arrow" cursor keys and spacebar on 48K+/128K machines and the Next.