how about setting it to:
itemid,rate,monsterid
this way we can remove the "common_drop.adv_flag" setting and will work same way, but no more config
so we can just put 0 in monsterid field instead or an actual monsterid if we want the item to have the global specified drop rate
if we put 0 in monsterid then it will affect all monsters with elunium drop
eg.
985,1,1150 // it will set moonlight_flower's elunium's drop rate to 0.01%
985,1,0 // it will set elunium's drop rate to 0.01%