Thanks Todd for repeating what I said.
2. Flip flops. There is no confusion. The law is exactly the same as that in the UK: Footwear must be fit for the purpose, i.e. not likely to come off, get caught up in the pedals etc. Unsuitable footware could amount to Driving Without Due Care and Attention, under section 3 of the RTA 1988
And you say the Highway code per se is not law, although of course some of what it contain refers to actual laws. It can however, be used to support other evidence of an offence, as in say Without Due Care.
And just because it does not say something (i.e. one should not drive wearing flip flops) that does not an any mean it is lawful to do so, or that it is not extremly likely that if you do you will be not be cautioned at the least, or in an accident prosecuted..
At an extreme I don’t think the Highway Code say you cannot drive with a hood over your head !!!! but that does not mean one would not be proscuted if they did,