I sincerely hope no one is topfilling OR bottomfilling while driving, that's a terrible idea. Perhaps I am just one of those folks who needs to pay attention while driving.

As far as that method in a bar? It is
no harder than a topfill necessarily, you just can't drink for the 3 minutes it takes to do it, since yeah, it requires two hands.
Me personally, with bottom fill tanks that like to have issues, I wrap clear packing tape around the base (the top actually, since it's turned upside down) to hold everything in place while I fill. Well worth it with my kabukis I find.... There's never any leakage or seepage around the top of the tank. I prefer to assembly line fill my tanks for the most part, but today I'm annoyed, both coils in both kabukis are bad and I
just filled them. Le sigh. This is why I cannot imagine dripping to be easier, in all honesty.... I'd rather fill a tank and then not have to do anything for a while. I think some topfill tanks are easy, and some bottom fill tanks are easy-- I guess that would make me a topbottomfiller or something (God, don't anyone go there please) but I'm okay with that.
Anna