ADOM has a great feature in the "full version" of the game: you can use the four arrow keys, up, down, left and right to move diagonally. The game utilizes some kind of key press delay to determine, if one wants to move diagonally and the diagonal move takes only 1 turn.

Can this be technically fitted into the "tile only" -version of the game?

I play ADOM with my laptop, which does not have a numpad and the full version on the game takes much more resources. This can be seen as my laptop's fans start and the important thing: when i play the full version, the battery only lasts like 2-3 hours and with the tile only-version i can play for like 7-8 hours. This is the main reason i don't use the full version within tile mode.