Is it acceptable for FDR to do the secret dealings that he did? What are the positives? Negatives?

Question

Acceptable to whom? The answer to your question involves your own philosophy. Do the ends ever justify the means? Or should actions always be legal, moral, and ethical, even though admirable goals may not be achieved in this way?

You may want to read Roosevelt's Secret War by Joseph Perisco.

Here are some additional sites which may give you some ideas.

http://www.paperlessarchives.com/wwii_conferences.html

http://en.wikipedia.org/wiki/Yalta_Conference
http://www.thornwalker.com/ditch/pearl.htm
http://www.rooseveltmyth.com/book/fdrmyth_Chapter_Thirteen___The_Final_Bet.htm

http://www.fff.org/freedom/0792d.asp

http://www.rooseveltmyth.com/book/fdrmyth_Chapter_Eight___The_Thought_Poli.htm