You must include at least one infantry unit of 10+ models.
I think this is prohibitive to some races. Ogres, even in the new edition are 30pts each. So you'd HAVE to have gnoblars, which is kind of annoying if they don't want them.
7. No unit can be larger than 25 models.
This is also prohibitive, esp. since you're forcing them to take them. It's like, "take some crap units, but not enough to make them un-crap."
9. You may not have more than one chariot or machine (except for the Tomb Kings).
Why? On all 3 accounts. Just make sure there's enough terrain.
Tomb Kings must have a Liche Priest as the hero. He will also act as the general. However, he can be up to 165 points. Tomb Kings can have more than one chariot.
No single Ogre model may cost more than 155 points. An A unit of Ogre Leadbelchers count as a single war machine.
Tzeentch and Nurgle Heralds are allowed to be purchased with up to 165 points. Exalted Heroes are allowed to be purchased with up to 160 points.
Why on all these? If you're going to set a point limit, set it. TZ and Nurgle cost base more cuz they're base better.
If you really want to get around all these caveats, say you can only have unit champions. Though that's pretty hardcore. But going through each army and saying what is worth 150 or 160 or 165 is going to never be a concrete solution. I say pick a value and stick to it. Why is a leadbelcher a war machine? It's already a rare/special, why penalize them twice?
In the case that cheapest Hero does not fit Hero allowance (in the case of Ogre Kingdoms), the hero's spill-over points are deducted from the Special/Rare allowance.
It's not their fault. Set the limit and if something can't fit at all, they get the cheapest, naked hero who can. It still takes from their point total. I can't think that's uber powerful enough to be penalized again.
I like weak magic in general. And remember, some guys got cheap 55ish point mages they can easily use. Since people aren't going to have disposable mages to dispel, the few who are led by mages will basically own the magic phase. Even casting magic missiles will wreck enemies, let alone buffs. And since there will be fewer enemy units/targets, a single debuff could end it. I guess since they are heroes they can only be +2.
I'd say in small point games like this, a lot of concern can be taken away by making terrain and objectives. Make it so you have to claim and hold something.