Good questions!
Answers, as of this post:
1) There is no time limit, instead the hue room ticket is used up when an item is hued with a color you have chosen. There is not limit to how many hue room tickets you can have. But you can only hue one item per hue ticket. That being said... you can hue several bolts, of cloth, a certain color, and then make items out of the cloth, later. [that is unless they changed this, recently]
2) The self repair deed is applied/used on a piece of armor or a weapon. Doing so, provides the item the ability to repair itself when the item, in question, takes durability loss. The [+1] implies that the item would repair one damage of durability loss each time it endured durability loss. {remember that in order for self repair to function, durability loss must be applied to the item first}
3) The Mythical Scroll of Leveling is a great find for a new player. Player crafted weapons have the ability to be leveled up to 100. All, exceptionally crafted, player weapons can be leveled up to fifteen for free. At this point 'Scrolls of Leveling' need to be applied to the leveled, player crafted weapon, to further the weapons potential maximum weapon level.
Also, understand that an X amount of experience is needed in order for a levelable weapon to gain a new higher level. Applying the scroll, of leveling, does not grant this experience; it instead grants the weapon a new maximum level potential. In the case of your scroll, when applied to a newly crafted player made weapon, the maximum level of the weapon would rise from 15 all the way up to 30. Then you can gain experience by using the weapon in melee combat, and killing MoB's. Each time the weapon levels you are awarded SP [spending points] which are used to better the weapons potential in combat.
4) I do believe that the Snow Covered Water Barrel is just fun Christmas time decoration. It may even serve as a container, so if you haven't tried to open it, maybe you should try.
{Note} I am unsure about the barrel being a container, as I have not found one yet.
--Sturger--