That is a good idea, for the next version (for engine 4.15) I will add a property that lets you specify a time for where the actor should begin the orbit. Right now, the plugin defaults the orbit at time = 0, which is wherever the actor is placed when an orbit is initiated.
In the mean time, you could use the attached blueprint to specify a beginning time. Add this to the begin play event for an actor. This example sets the starting point of the actor to the halfway point of the orbit (The orbit period / 2). If you have a server time for how long the world existed, you would need to take that server time and divide it by the orbit period, and the remainder would be the starting point of the orbit. This will only work for the ‘Kepler’ orbit mode.