Map Filter for Item Set Builder

Hey! I was wondering, why are there no filters for the TT/HA/SR maps in the Item Set Builder? As it is right now, there are SO many items to scroll through, to find what's basically a needle in a haystack, where the needle is the item (or item type) you are searching for, and the haystack is the clutter of items not related to (for this example) Summoner's Rift. There are even options to make the Item Set -Map Specific-, but there is no filtering out the other maps' items. Please, implement a map filter for the items. Thank you for reading.
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