The steering SHOULD be quick(er), as it is (supposed to be) the Aero Racing 3-turn steering rack (in oppostion to the 3,3 fitted to usual trads) - so interesting to read, it feels "slower"..

the spec sheet for the +4 SS does state "3 turn steering rack"
The Morgan Plus 4 SuperSports does have the quick rack (3 turn steering rack).
Steven (1560) is simply stating a preference for an even quicker rack (which used to be available from an aftermarket supplier; however, there is a question as to whether they are still in business). I'm not used to lazy steering and I find the Plus 4SS to be quick enough - anything more and I can imagine it being far too skittish for road use.