Why should it? As far as I understood, changing the syspart.conf just changes resources utilization on a per-process basis, and that's the whole reason for ohmd presence. So, it should simply lower their priority.
What I can affirm is that on my machine in its current state, the baloons are now delayed (also 5 or 10 seconds) while chatting, don't know about emails, but I hear both vibration and notification sounds.