Grim's Portfolio of Newbie questions

[GrimSloth]

Hey there. So I realized that down the line, I'm gonna have quite a few questions about the game. So instead of making a new thread for each question, having just one, bundled with everything on my mind would be better (plus less spam). The OP sadly cannot be edited after some time has passed, so I'll try to format things as best I can. So without further ado:

Question [1]

What's up with regeneration in this game?

Something which has bothered me since day 1, was how awkward regeneration is(both HP and MP). For some reason it spikes up and down. Sometimes less often, sometimes quite often.

Initially I thought it was zone modifiers. Then I thought there was a hidden bleed/hurt mechanic. Then maybe the hunger mechanic, but I'm always packing food and water and it gets automatically consumed from what I've experienced so far, so it can't be that too.

Question [2]

Chance to hit

Is this only based on level? Is there any way to improve it? I made an alt Shadow Knight whom I'm enjoying quite a lot. However I can't dare battle anything which is yellow, because the vast majority of my attacks miss.

Question [3]

Lull line of spells

Ok, this one is pretty dumb, but I'd like to be certain about it. I saw a lot of Enchanters on youtube still rocking the starting level Lull spell. Likewise, I'm sticking just to it and haven't picked up its follow up upgrade. The question is, what's the difference between the different lines of Lull like spells(apart from duration). Is it hit chance?

Question [4]

Modding

Is editing textures allowed? I normally wouldn't ask this for an MMO, however in the Duxa installer, several texture alterations are present, and those seem to be a-ok. Now I know this is a sensitive topic, but making a change like this would be local only. I don't want to initiate anything yet in case it's strictly forbidden and has a steaming ban hammer on the side.