these little coins appear in your 'combat'' tab, [like where it shows what attack your currently doing, and how long till your next attack] they are your initative. also, a little coin noise is made and a purple +1 appears above your head whenever you get em.
and agility doesnt effect speed, nothing does, except the attack your using and your combat manuever
I believe agility does effect speed. I remember them saying something about it when bottleneck wanted to get all their people to have bunny slippers because they thought more agility made you move faster.
Agility is used by a few combat moves (Notably "Sidestep"), but apart from that it does nothing.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."