I don't have as many as hang-ups in RnR battles as I did in the EXE games, but there are a few.
I always used Star Force in my Green Dragon game whenever the card came up, even if I was going to win in one round, or I was fighting Ox Fire. XD
Whenever I fight Blackhole viruses, and no sword-type cards come up in my custom screen, I still activate the cards that come up anyway, even though they do nothing.
I tend to chain ParlyzPlus cards with PlasmaGuns because I'm too impatient to wait for a Battle Card that doesn't already have the power to paralyze.