Ceiling walking

Yes you are correct on all accounts I believe. Yes it was done for cool effects. When I watched it, i was wondering if they train that way lol. I can imagine someone saying. "If there is any trouble, we all run towards the ceiling and shoot from hanging upside down like a bat. This will confuse the intruders and we can jump to the next place we want to go. John, you get the left side of the ceiling, Frank, I think that's Frank bc you are all wearing masks like the gimp wore, you get the right side. I'll take the middle." Frank: why can't we just shoot them? Leader: BC we have to look cool man! You can't just shoot anyone in the Matrix! It's all about style. And you can't hit them with your first shots, you have to miss on purpose and have as much tile and wall shatter as you can. Kinda like in Die Harc when they shot the glass on purpose. The first clip is to break as much stuff as possible. Then you run and shoot making it extra cool. Only then can anyone actually shoot someone. I talked to Trinity and Morpheus and they will do the same thing. If you can hide behind a pillar, they will unload a clip on the pillar knowing the billets won't go through. But it will look wicked cool!"

Its just one more minor trick to disorient their enemy. Standing on the ceiling means that they are also seeing Morpheus and Trinity upside down, but they have trained for that and know that its coming.

Morpheus and Trinity don't expect that and will be slightly delayed in their actions. They are going to peer around corners and forget for a second that they are looking in the wrong direction. Stuff like that might just be enough to give the guys a tactical advantage.