You can use arrow keys to navigate in the map.
Brute forcing means that whoever is willing to sit there the longest plugging in letters will be able to get a higher score. This can lead to stale, noncompetitive game play.
It is almost the same as screen peaking
Everyone has the same advantage of being able to guess without penalty.
Using random combinations of letters (that are both already on the board and on your letter rack) until you find a word is absolutely okay.