Hello,
A little but useful improvement in the Library editor will be to save the grid settings in each LBR file, for each package.
Today the grid setting can be configured with the eagle.scr file, but it's not enough since we use a different grid for each package (pitch of the package !) So each time we reopen a package, we had to set the grid again and again....Boooooring! 
A global value for all packages of the library is meaningless too since that we can have packages with different pitch in the same library. 
So the best would be to save the last used grid for each package, and when we open a package, the grid will automatically set with the good value ! 
Guillaume.