Multiple 10g instances (standard edition) one machine / resource allocation

It has been suggested that we could set-up a new production environment on 10gR2 (2 instances) using VMWARE. This would enable us, as I understand it, to allocate the resources of the server in the ratio we choose between the different databases as each would effectively be running on its own machine.

I can see that Oracle does not support installation of its products on VMWARE
(see
https://metalink.oracle.com/metalink/plsql/f?p=130:14:8993822913808118385::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,249212.1,1,1,0,helvetica )

So to me it would seem foolhardy to progress with that idea.

Is there any technology in 10gR2 (Standard Edition) that enables the allocation of a finite set of resources that may not be exceeded?

Thanks

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jeremy