In the config folder, in the hqm folder there is an image file, change that with the one you want (edit the one that is in there, as the dimensions are weird)
Out of the question. Sorry, but I think I speak for most of the FTB team when I say it is more effort than it is worth. If you were going to do a tutorial on every mod in the pack, you are looking at around 150+ questlines (1 quest line per tutorial), which would make HQM laggy (and probably the game), but it also means a lot of effort on the FTB literary team, and those in the Phoenix Team, which would be writing the quests. If we say, on average, there'd be 15 quests per mod, all which need a little bit of text saying what the item/block does, and how to use it, then at a minimum you'd be looking at well over 2000 quests. And personally, I hate writing quests, it's a slow process, now just think how many of us there are that would be writing quests (let's say 10, just to make this easy) that's around 200 quests per person. And the fun thing with HQM at the minute, it is impossible for multiple people to work on the quest book at the same time.
In a kitchen sink pack, which has no direction and is meant to be played at one's leisure, not played with quests telling you how to do stuff and making you give X amount of items.