Someone on The message boards of SpaceQuest.Net is developing a patch for the many timer bugs in the Sierra SCI games.

http://forum.spacequest.net/viewtopic.php?t=183

I tried it on QfG 4 and using just VDMS it sems to have worked. Though I have not yet played through to the point of the infamous Error 52, it works for some of the earlier bugs, such as on the slippery slope comming down from the caves and the antwerp maze. It also worked with the scene with Yorick's maze in QfG 1 VGA.

Many from the SpaceQuest.Net boards have reported that it works for the bugs in SQ 4 and SQ 6.