Yes you can manually update it. The version is currently on 2.4.10 and it will remain that way for a while while the next big update [2.5] is prepared.
This should have been fixed for 1.1.1. If it wasn't, then I fixed it after I passed the version to them. The problem originates from the Shroom Stone not checking the config for Mysteriums ID but checking an old hard-coded value [12].
Then I'm really not sure I follow. You asked if it could be properly enchanted with Infinity, to which I responded that any of the enchants work. Yet for some reason me saying that was a "Captain Obvious" moment. If this is the case, why ask. :confused:
All AoA weapons are enchantable. The special enchants [Archmage, Sever, Crush, Intervention, etc...] can only be applied from an Infusion Table. All vanilla enchants can be added to corresponding types of items as per usual.
There indeed was a bug where Shroomus would be checking a previously hard-coded dimension ID. This is why it worked for some people, as they didn't configure it. However, that bug is now fixed.
Some people will just never get it. I mean, I've had people tell me the mod is too easy because they can spawn stuff on creative or cheat it in. I guess every game in the world is easy, I'll just play on god-mode. :)
In general water mobs/creatures like to spawn in ridiculous amounts. Squid spawning being super high in the ocean is very normal. Not many mobs at all spawn in oceans to begin with, so squids/pinchers are bound to fill up that requirement.