I am not entirelly sure, if it's right place to ask, but since it's closest to Support/Help section and people post help requests here...
Anyway, I am making private modpack for myself and few friends, but I've run into two distinct problems so far.
First and bigger issue - Forge somewhat isn't loading, despite I've done everything correctly, or at least I think so. I got lastest recommended Universal jar for 1.7.10 from Forge website, renamed it to "modpack" (without touching extension, so have "modpack.jar", just as it should be) and put it into /bin folder, and my .zip contains only /bin, /config and /mods folders, all of them in main directory of .zip, without any addional folders about it. I checked it three times and everything seems fine to me, but after uploading and installing pack, I get "mods missing: Forge" upon trying to play game.
Modpack link is https://www.technicpack.net/modpack/paczka-taka-tasmanska.1560079, and direct download from Dropbox is https://www.dropbox.com/s/l6dewylcoa5x7zl/TasmanskyCraft.zip?dl=0. I am not posting logs due to fact they contain no error nor crash report, and everything seems just perfectly fine there (I have compared every line from fml-client-lastest.log that contains "modpack.jar" reference with similar lines in said log of another, working Technic Pack, and they are virtually same). As for crash log - there isn't any, due to fact Minecraft isn't crashing at all and thus log didn't get generated.
There may be some redundant config files left, as I was basing at first on FTB Infinity Evolved pack and used it's client to generate addional configs and test few things in motion before I started to create pack from scratch. But despite of configs, all mod files are of my choice and are fresh, direct downloads from CurseForge (with exception of Jammy's Furniture).
As for other issue, I look for some help with explaining me basics of how to configure Just Another Spawner, as I am running few biomes and animals mods in pack (of most important - Biomes O' Plenty, Mo' Creatures, Exotic Birds, Blood Magic, Aether II, The Betweenlands and Twilight Forest) and I have a lot of troubles managing spawning rules (and don't want to rely on vanilla spawning due to abudance of Exotic Birds birds everywhere without much sense behind their spawn location and very low spawn rates of Mo' Creatures animals). I have read documentation on JAS wiki and checked few example config files on my own, but still have no idea, how this is supposed to work (and Google throws at me my own reddit post on /r/feedthebeast at very first page when I am searching for JAS tutorials...), so I'd be very glad and grateful if someone could help me and explain what and where to modify to achive effects I want, preferably with examples (just few lines, so I can get what exacly to do and where). What I want to get is:
Mo' Creatures mobs spawning only in Overworld (and few selected, like Scorpions, in the Nether)
Exotic Bird creatures spawning in Overworld and Twilight Forest (some of them at least)
Biomes O' Plenty creatures spawn in their own base habitats only
Aether II, Betweenlands and Twilight Forest creatures limited to their own appropriate dimensions and using their build-in spawn system
Mo' Creatures and Exotic Birds creatures divided into groups basing on their desired habitats and limited to spawn in them (so I won't get elephants in regular plains or forests, and peafowls on mountaintops)
All passive animals spawning only on chunk generation and no despawning (just like regular vanilla animals), while aggresive spawning only in right conditions (night etc.) and neutral utilising both spawn methods
Also, have a sidequestion regarding this one - is it possible to distinct between mob variants of Mo' Creatures on spawn managing level, so I'd get, lets say, lion variant of BigCat mob on savannas only and snow leopard variant in snow biomes only, instead of total randomness? According to MoCs wiki, they should behave like that on deafult in vanilla biomes, but as far as I have seen in my reference client, it isn't working in Biomes O' Plenty enviroment with deafult configs.
Thanks in advance for any help!