Lootfilters are amazing as they already are. You can use a premade one, edit those, or make one yourself. Some rather usefull featurer are missing though:
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copying single rules into ANOTHER Lootfilter. At least you can not do this ingame.
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selecting several rules and changing recolor and emphazize in one go
Why would anybody need this? Imagine playing an alt, but you still want to look out for the one exalted weapon and armor missing for you main in the season to slam that sweet 4 lp you found. You already rules set up for these, but can not copy them into you alt Lootfilter.
Same with Filters from guides, where you´d only need like 10 rules. Now you can import that filter, but you have to tweak it to your liking as well as manually setting up those rules. This includes the color scheme used by the creator. You are surely used your color schema for the different items you want to be highlighted.
Setting them up manually or manipulating does cost time, and the more times you have the need to do it, the worse it gets.
Being able to copy and change multiple rules at once will help a lot of players using this amazing feature.
Special note to creators that may read this: please come to an agreement into the color schema used for items. So if this request is never implemented, you would still make a great service you already do more special, as we will not have to get used to different color schemas “all the time” (<- depening on rolling multiple toons).