It is hard to not accidentically do this, for instance when doing fast accel. It is also possible that the speedrunner uses an very low position for his finger on the left button for some later uses, and may cost confusion but is not banned. Anyway it is OK

my objectives: Get a sub-5 any% and wall jump. I suck at doing the wall jump even with the two frame setup.

When I look at this thread, I think about Kosmic's video about beating SMB in Animal Crossing. This still can be there. The only reasonable time saves are the 8-1 and 8-2 framerule. By using L+R fast acceleration, it would be much easier to save the frame rule, since the fast acceleration would save some more frames then.