P,
As you rightly say flying in IMC is good fun and rewarding.
However it does not float everybody's boat and if more IMC flying was incorporated (even to the level of 'just' an IMC) those that don't like/want it would just see the cost of a PPL go up by 15 hours of dual.
May be incorporating the night training would not be a bad plan as it could be done at no extra cost and would confer some good practice and useful experience, especially as 6 months of the years the nights draw in early on these shores!
FD