I've now found a nice replacement for Multiview that works with WB2.04+

It is called "2b_mv_os2" or "OS 2.0+ Multiview replacement" to give its complete name.

It can be found at http://aminet.net/package/util/sys/2b_mv_os2

I've tried it out on my A600 and it works perfectly. Hope that is useful.