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Lately some ideas for additional pings have been brought forward, so I wanted to contribute.
What if there was a directional ping, where the player could draw a straight arrow on the minimap (think of Rumble's ultimate). This would be extremely useful for organizing ganks or asking for assistance from a lane, or point in the direction an enemy champion was heading.
I believe this would be really useful and i have wanted a feature like this for awhile now, it would also mend some of the misinterpretation acquired from misplaced or poor pings.