I candidly believe that the remainder of the number keys should be populated by emotes.
5) High-Five (obviously) -- when leaping this becomes chest bump.
6) Sad
7) Dance 1 (whichever one you have trained in)
8) Dance 2 (your second known dance)
9) Dance 3 (everyday I'm shuffling)
0) Wave
actually i think that 5 should be both a wave and a high-five, but in order to execute the high-five, you would need both glitches to do this together, maybe also while jumping. (citation provided)
I love the wave idea, and I'm a huge advocate for the High Five. But I'd love for high fives to work like hugs and waves to work like a facial expression. Waves are more casual