[ESS] How do I best set up M-x R32 and M-x R64?

[John Maindonald]

I can make at present make a change to ess-sit.el so that
M-x R invokes R32 (Simon's recent R32/R64 choice for
Snow Leopard).  But how can I easily change my setup
so that M-x R32 invokes R32, while M-x R64 invokes R64?

Thanks in advance!

John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Mathematics & Its Applications, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.