Maggots can come to you quite greasy or just plain damp from the fridge, so it often depends when you get them with regards to their life-cycle and also what processing the shop has done to them.
I've always found maize (and turmeric powder) can help to soften them which helps when hooking them.
I agree, however saw-dust can clog up as well; they may need to be riddled often depending on how warm they are as they tend to sweat the more they wriggle about / the hotter they are.
As above, some anglers add things to their maggots and some don't (I do), it's really up to you - I will add caution to liquid additives though, only add liquids if you are going to freeze them in a sealed bag ... maggots spend their whole life wriggling, the liquids allow them to stick to the sides of anything, they can even crawl through the tiny pin-holes in a bait box lid.
So long as they are fresh (dry) don't put a lid on them as they can sweat - even if you store them in the fridge, they will be safe since they won't wriggle about much, keep them in the lowest section - once the other half gets used to it they will be fine with it.