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there is scope for shared ownership to be a bit more restrictive
Yes - the freeholder can get away with even more murder than usual and you can never get RTM or SOF because of the shitty multi-tenure nature of the developments preventing you from getting the volume required to turf the landlord out.
Because of this SO places should be discounted by 15%-20% compared to single tenure blocks but guess what people poney up for them anyway.
Ah yes, that was just an example of what may bite you. Obviously it will all depend on the lease but it sounds like there is scope for shared ownership to be a bit more restrictive and the no sub-letting seems reasonably common. It seems the theory is that if you're having the benefit of buying it on shared ownership you should be living there.