i believe theres a way to "set current state".
i think you set up the brick wall, not including your hover jet, then run reactor. the bricks will settle. when they stop moving, you stop the simulation and from the pulldown menus on the top of the real-time window there should be something like "use current state". click that and it'll update them in your viewports. next time you run reactor, then, they'll be right where they should be and won't have to settle again.
it's been a long while since i did this, so that could be totally wrong, but maybe check it out. if i've mistakenly said something was in the wrong place, please someone correct me.