MPL is the Modular Python module. IIRC, it has never been finished and is therefore totally unnecessary. If you're having trouble with the launcher (as I do), you can activate and deactivate modules by moving them from the Inactive Modules/Normal Modules to the Modules/Normal Modules folder in Assets. As for the Archos, it's alright that scorpions are weak since their spiders can become very powerful and terribly annoying for other players in early game and c'mon, you're given FREE cannon fodder, why do you complain? However, the ability to be promoted to swarm would make sense. And maybe give them a low defense, but decent attack and first strikes, so that even if they're very likely to die, they deal damage to enemies and poison them.