Chuffer - I learnt to fly at Shoreham, and have done all my flying from there, and I have to disagree with you. ATC have always been excellent, and very accommodating.
I can see that full ATC is not required at all airfields, but Shoreham has a greater mix of different types and I don't think making it A/G would improve safety, quite the reverse. Plenty of pilots are capable of flying safely, but in my experience plenty are morons who don't - ATC does help to protect you against them in a busy environment.