Maybe its a bit much to expect, but shouldn't the Yor not have any morale at all. The impression I got was that they were supposed to be made more machine like. You know being all about efficiency and not worring about trivial organic things such as "feelings" or "happiness"? I don't know about you, but I would think it is likely that they would have discarded such inconvient subroutines the first software chance they got.
Let me explain what I thought we were getting:
1. No morale
I thought that the Yor would have no morale what so ever. I was thinking that they would have a base population growth rate, one that would be improved by various techs. Examples would be "efficient population production", "Improved population production", etc.
Ofcourse, always having 100% morale does run into the problem of absurdly high populations. One way to deal with this is to provide a growth rate penalty, and a large upkeep costs to maintain a large population of machines. One might expect that you need pay for the expenses of extra mechanics, otherwise they are going to be highly demanded and very very busy.
(Maybe having a slider to pay for extra mechanics in the economy window might work. It would affect the max population, and population growth rate.)
2. No tax slider
Why would a species dedicated to efficiency care about taxes. Shouldn't each Yor be donating their services to the collective? Wouldn't that mean that they would be collecting resources instead of collecting taxes? I'm not saying that they must be better with "money" than the other civs, they might be missing som economic creativity of a capalist system, but rather they are always providing maximum efficiency.
Various techs could be used to increase this efficiency, like those that already exist, and/or new techs that increase the effective tax rate. So the Yor could start with a default tax rate of 40%, and several techs could increase it by +5% or +10% each for instance.
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If you are still working on these, then ignore my criticisms for the time being.
