You don't need to put points into perception if you want to increase your Start Action Points (SAP) and Turn Action Points (TAP), since you get the same SAP bonus if you add those points to speed instead, but get additional TAP on top of it.
You only have to put points into constitution when your max AP value would become less than your TAP.
This becomes a big necessity when you have the talent Glass Cannon, especially in combination with Lone Wolf.
