Seems cpu affinity is just counting the started sessions when doing round-robin. If I start one session, it's cpu1, second goest to cpu2. But if I restart second session it ends up in cpu1 (dual-core system).
Would love to see it keep track of cpu usage count and choose the first cpu with lowest session count. Again nothing major, I go by by restarting the new session again to get it on 2nd core.