I was thinking about this and I have a thought on how to "fix" (change) this.
When I got my Mini Lite, the light switch wasn't full seated on the wall. For some reason, they'd put a whole ton of RTV on the wiring. I pulled the switch out and had to cut off all the RTV to make it sit flush again. I noticed that there were two wires on one switch connection and one wire on the other. I'm assuming that the single wire was power (+12VDC) and the two on the other contact were one to the light and one to the fan. Seems you could remove the one from the fan and splice it directly to the power wire and eliminate the switch from the fan circuit.
I may try this; but my problem is my bathroom has TWO lights. If one wire goes to the light above the sink and the other goes to the fan and then on to the other light, I won't be able to. I guess an experiment is in order next spring.
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10