Dick, there are no continuous helicopter joy flights to be stopped in Melbourne. They are random and indistinguishable from day to day helicopter movements, which have operated from the Yarra helipads for about 40 years. Your research will show you that.
Dick is spot on John. There are near continuous joy flights from the Yarra on a daily basis; not all day but enough to be annoying. I counted more than half a dozen yesterday (a Thursday) when I was there for around one hour. Depending on where you are standing, you literally need to pause your conversation whilst they warm up and depart.
Microflite operate up to two EC130's (or smaller) from the one pad just down from the World Trade Centre and PHS were operating a Jetranger which flew multiple times from the council heliport opposite Crown. Microflite even operate a 130 in full red and gold Crown Casino livery.
(I know you are aware of the finer details JE, just noting them for Dick and others)
In all honesty, the operation of these helicopters doesn't seem to be in-line with a fully risk-adverse approach. I haven't spotted any warning signs regarding the coexistence of boats and helicopters where the helicopters lift off and literally reverse out over the river regardless of what is below and plaster them with full downwash from a 130 or similar.
JE - can you please elaborate on why the operators of the council pad don't allow R44's to land, or advise against it, don't allow it or otherwise? (Correct me if I am wrong of course)