I also thing that it's annoying where HP bars get covered by FoW but it would be a puzzle to make work properly. I mean if it's ALWAYS on top, then if there are monsters hiding in the FoW players will see the HP bars. I like the mouse-over idea, but even then if a player mouses over and then discovers a hidden token with bars in the FoW by accident with mouseover... hinda defeats the purpose a little, so I understand why it is as it is... I mean right now it's also an issue if the hidden token is too cklose to the revealed are the PCs can see that HP bar peaking out too, so they know it's there. A bit of a catch22 unless you can code it to be able to know how much of the token is covered... like if more than 75% of the token is covered, don't show the bar and less then 25% you can show the bar on whatever layer.