Yes, this is a really big issue. It's why I quit playing WoT. The problem is, if u make it so that when someone resigns their king instead of becoming a zombie, becomes a dead piece, is that someone can resign when your about to checkmate them and so u don't get the checkmating points u deserve. Tbh, the best way to fix this is just to do teams, teams are better than FFA.
A Problem With Zombies
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If you play any sort of 4pc, you would probably know what a zombie is. When a player resigns, their pieces continue to move in a random way. However, some people can exploit this. I do this myself, but the problem is found somewhere else.
The main issue is that zombies can just put other players at an advantage. Who cares if they're playing horribly? All they need to do is follow the rules and make a random move every turn, with no thought whatsoever. This can have a bad outcome.
Lets assume that you are playing a 4p giveaway game. Everyone but one person has one piece remaining. One of those three players is in a better position, and wins first. The player who has taken that piece realises that there is no chance that he can win, and so resigns. The piece that the player used to take the other person's last piece is put in such a position that it can capture either of the two remaining pieces. It's a 50/50, and the zombie decides to take the other player's piece, leaving you in the point-losing zone.
Imo I believe that they should be in the 'stalemate' state (that is, when the pieces of that player turn grey). This gets rid of a lot of useful gameplay, but it is one of the only ways to fix this problem. Let me know what your thoughts are.