I figure it might be better here to post possible improvements.
I've already addressed this in IRC, but I did notice there were places when you are moving the cursor for the RN manipulation, where it can be done faster in a different location. For example, in Ch13, you manipulate for the boss kill here:
when there is an unobstructed area that can be used in the north-west. There are other places like this where RN manipulation can be done faster in a different direction, but this was the most glaring one.
Another possible improvement I have is giving Marcus the Energy Ring that Dorcas starts with. Giving him the item is a simple matter of trading in Ch11 Turn 2, as soon as Dorcas appears. The time taken to get and use the item should more than pay for itself, as Marcus will have 2 higher Atk with which to get more OHKOs, and can also save less manipulation later on if getting Str in a level is particularly time consuming - even gets to cap the stat sooner so you can get blank level ups earlier.
A couple of chapter strategies have possible improvements. As seen in the Japanese TAS linked earlier, opening the door and critting the soldier in the same player phase will be faster than letting him move on enemy phase and getting 2HKOed.
Ch11 doesn't require Eliwood to crit all three enemies after he is dropped, just enough so that he can seize - so just the first two, saving time with less exp gained and RN manipulation.
Ch16 could have an improvement, if a 7 move unit was to hang back from enemies, using Marcus to charge forward and kill stuff, and hand Eliwood to Marcus once all the archers in the western corridor were clear.
I'm probably not completely right on a couple of these, just going off observations I've seen while watching this. The improvement Nitrodon discovered will also save time in a few places, but that should be a matter of easy hexing where it does save time.
For those that weren't on IRC, all three of the GBA games have the camera scroll on where the cursor icon is located, but the arrow while moving can move beyond that location. Normally, holding B while moving keeps the cursor moving fast enough to keep up with the arrow. The problem with this is that once a move location is confirmed, normally the camera scrolls back to the unit before moving if you go too far from it.
With this new trick, by not holding B, or only holding for a few frames, you let the camera move slow enough that, when you confirm the unit movement the camera does not scroll back and the move happens straight away rather than waiting. It doesn't work in every instance, but it will save a good few frames when it does.