I also work at a hedge fund trading currencies and have discussed this with contacts there.  

He argues that currency shouldn’t be measured against gold but only other currencies.

4) Will currency price swings cause more or less impact on gold prices than industrial use slowing down?

Yet ask these same people if they've hedged against the risk of interest rates rising or the dollar losing it's reserve currency status and most look at you like you're crazy. 

Any advice on how to minimize any costs associated with foreign investors sending cash to the US for RE investing? I know that using dollar denominated accounts abroad is useful, but what are other options given the l...

If you're european or japanese with some capital to allocate US treasuries look pretty damn good compared to the sovereign debt available in your home currency.  

Dollar is strong against major currencies as well, which adds to our export headwinds.  

We made money on the rehab of that house, but also from the currency conversion. 

I am a currency and commodities trader.

I am planning to invest alongside him, but I am not sure if it is possible to invest from the US ( currency effects are not a consideration at this point but will consider them later).Is there someone here who can help me with the following questions- What are the legal requirements and paperwork needed for US investors?