Love square drive, use them exclusively in the wood shop so no issues with having plenty of driver bits.
I agree, kind of stupid. I've now winterized 3 times and just remove the panel and re-attach after I'm done. Just make sure you put the valves back in the normal position or you have to remove again in the spring.
I too was going to put in some hanger bolts and some wing nuts, but it is way down on the list :-)
2014 Whitehawk 33BHBS
2014 F250 4X4 Crew Cab 6.2 l 3.73
2010 F150 4X4 Supercrew 4.6l 3.73 (traded in)