Ok, first of all I can't make a poll for each micro change to layout. That would be insane, also considering that we don't have much time left to finalize the legends. We had the IC and nobody argued about the two words BACK SPACE then. I just tried the one word version and I will be posting it soon.
Regarding INS/INSERT, DEL/DELETE, PAGE UP/PGUP, etc.
The most important thing to maintain imho is font size consistency. There's no way we can fit the word INSERT into a 1u keycap without reducing the font size. This would mean reducing the font size for all mods.
Originally I wanted all mods abbreviated, but I've been criticized for that, so here we are. If you can suggest a viable solution I'll be more than happy to implement it.