My first thought was the same as tec's. Here is what the FAQ says: "Gold Glove: Fielding percentage, good plays, poor plays, Errors, and Range Factor". The FAQ then goes on: "In each case, there are weights assigned to the individual components for the award calculation. While real life awards are decided by writers using the core raw stats and their personal opinion of how good/valuable players are (despite numerous objections by other esteemed writers across the land), HBD can use more appropriate statistics and accuracy to determine the best of the best.
If you think you have a player that should be up for an award but he isn't listed, be sure to evaluate all the component pieces and compare them to the players ranked ahead of them. It's hard to take sometime (like when you have a player with 55 HR, 150 RBI and a .340 AVG not in the top then), but there are always reasons why they are ranked where they are. They could be playing 1B while those ahead are SS & CF. They could be playing half their games in a hitter's park while those ahead play in pitcher's parks. Many reasons, all put together, and the best are at the top of the pack."
Reading between the lines, with similar raw statistics the rate of accumulation is likely given weight in deciding between the two. Maybe the only time when less playing time is given greater weight in determining awards.