What restrictions and benefits are there for holders of a non-temporary resident visa in The Netherlands

This is theoretical as my EU citizenship is pending.  My partner, who has no prospect of EU citizenship, and I are planning to live in The Netherlands.  I gather it shouldn't be too difficult for her to obtain a non-temporary resident visa once I have my EU citizenship.  I've looked but haven't found answers to the following:

1. We will be returning frequently to Australia to visit friends and family, and for me to work.  How much freedom to do this is there if one wishes to retain residency.  What about journeys within Europe?
2. What rights does a holder of a non-temporary Netherlands residency visa have in other EU countries.  For example, can we move to Germany or Italy and simply transfer the residency permit? Could my partner also work in Germany or Italy under these circumstances?
3. How can I find out the implications of transferring my businesses from Australia to The Netherlands?  Which companies give cost-effective advice to expats on questions such as how to avoid double taxation?
4. Might we, in fact, be better off having an apartment in The Netherlands and not staying for more than 3 months at a time so that we are, in effect, tourists in The Netherlands.  The problem with this, however, is we cannot stay longer than 3 months every 6 months in the entire Schengen area as tourists.  This would make it difficult to settle and make friends in The Netherlands if we are not there much and would restrict our opportunities to travel within the EU

Thanks for your help.