I doubt it will cause problems, however you can rest assured that over time the sensors will stop reading accurately no matter what you do.
I use NO CHEMICALS in my tank and have no odor and my sensors still work on a 1997 5th wheel...I think the best advice is after emptying add about 5 gallons of water through the toilet so you never do your business in a dry tank and never leave your black valve open while hooked to a sewer system. For the tank to work properly it needs plenty of water to break the waste down, so use plenty of water when flushing and after dumping put some more water back in.
I dump my black about once a week and then dump my grey to wash out the hose. When parked for a long time, I do sometimes leave my grey valve open to the sewer hose, but generally a day or two before I plan to dump my black tank I close the grey valve to accumulate some grey water to flush the hose.
I do sometimes add some water before a road trip and a little liquid dish soap and then empty when I get to the next campground, that seems to do the trick for keeping my tank as clean as it needs to be...it is black water, so it will never be spotless!
Good Luck,
Jim