Enemies packs and zoning...

Hi! Ok this is another infamous question of my blacklist:
i need of a bunch of space for formations, packs and some knowledge about zoning of FF3usME i think it's necessary now.

I'll write down a list of questions:

1) Lobos everywhere! they almost fill half of the whole packs list and covers all the zones of Veldt... which Lobos are actually used/necessary for the game? i'd like to replace all that useless packs with new formations and monsters;

2) Like lobos, i believe there's some other formation not labeled as dummied content in the game which still won't show... for example in zoning(above 127) there are too much leafers... any knowledge to share?

3) In the Packs screen there's a mysterious flag for all 4 formation slots which says: "Rand. w/next 3"... what does it mean and how it works?

4) Zoning: first 128(0 to 127) slots are used for battles in WoB and WoR... How 'bout the other 128? some slot is clearly used for dungeons and bosses?(so the note says) but not all the slots... how they work?
And even more important: how grass/forest/dry land and desert slots affects the ones after 127? and finally how can you use unused slots of zoning?