Why would you want that pin hot?
Some cargo trailers I have towed have an interior light that is only powered from that pin.
There are adapters that will plug into your 7 pin on the truck and give you a "cigarette lighter" outlet which can be used for all kinds of things.
When camped and the RV is plugged in the converter will keep the truck starting battery charged (the wire works both ways). This way, after the truck sits for several days with various radios, cell phone chargers, etc. plugged in it will still start.
If camped without electricity and then towing to a new campsite also without electricity I would certainly want my tow vehicle providing any charge it can.
If it really bothers you that it's hot install a relay. I've had 4 Chevys over the last 13 years that were all wired this way. I never had any problems.
