It would be really helpful to add an npc to the test dojo character building area, which would give past lives of all kinds out.
Talk to the npc, pick Heroic / epic / iconic, and then for each past life type, a choice to grant 1 / 2 / 3 feats of it and also allow to remove all that type of past life.

This would really speed up specific build testing, it's hell to TR / ER over and over to get the right PLs.