</font><font color="blue" class="small">( I will be able to use the rear remotes for additional control valves, but in this set up, the 3PH valve will not operate simultaneously with what ever is connected to the rear remotes (as MAD pointed out). )</font>
By simultaneously, do you mean that you can't operate the 3PH while you have something (anything) connected to the remotes, or just that you can't operate something off the remotes and raise/lower the 3PH at exactly the same time. The first sounds reasonable, the second doesn't sound right to me (but I could be quite wrong).
Did you get all this working, btw?
Dave