Hi Capcanuck,
The PowerExpanders are meant only for end-loading receivers. The wires are just too short to go all the way around to a top-loading receiver. I have had a number of people use top-loading receivers by doing one of two things. Most common is to turn the receiver upside down. The other way, which only 2 people have done, is to make the wires longer.

As to powering your smoke pump off the PowerExpander, it is still advisable to keep things like this powered separately unless you are sure they will not generate any interference.

Please let me know if you have any further questions.