I know that we arent able to define them for a specific play, but is there a way to find out who the intended go to target of a play is and any secondary targets? Or is the only clue usually the name of the position in the play name. Like say I wanted a RB or TE to be the main passing target on a play, how would i do that?

For instance, here's how the QB read progression code works:
1) QB randomly chooses a receiver to be the primary target based on the weight of the play and the routes being run
2) The QB waits for the primary receiver to complete a route and then moves on to the next route, waits for it to be complete, etc.
3) Based on the receiver that the QB is staring at, he decides if he wants to throw the ball

How the QB determines the primary WR is here: http://mfn19.myfootballnow.com/community/3/1361?page=0#8134

In 0.4.1 the QB will not wait for the receiver to finish his route if he is under pressure also.