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I think my reply to Angus covers most of your points, except this one:

On 08/07/14 17:39, Steve Baker wrote:
> On 09/07/14 07:08, Zane Bitter wrote:
>> Constraints, I feel, are very similar to resources in this respect. I
>> am less concerned about template formats, since there are so few of
>> them... although it would be really nice to be able to install these
>> as subpackages too, and using stevedore appears to eliminate that as
>> an option :(
>>
> To me constraints are more like client plugins. They make API calls and
> need specific knowledge of client exceptions. That is why I have been
> moving them into the client plugin modules. It would be preferable if
> they used the same plugin loading mechanism too.

OK, cool, I'm persuaded by that. So they are like client plugin plugins? 
Should we consider doing something like with the intrinsic functions, 
where we just tie them to the client plugin?

cheers,
Zane.