1) arrows kill enemies, not bows. Bows require killing enemies to ID them (besides the more esoteric methods of IDing things). Arrows require a number of turns to ID, presumably because the game thinks that you kill with bows, which you don't. Or in any case the number of kills needed with a bow never goes down.
2) You can't use wands. 'u' only checks for if there's a keybound item, as far as I can tell.
3) You can't use the highlighted letters on the title screen; you have to use directional keys and then press a confirmation key.
4) Sacral magic is really weird. This might not be a bug, but if used properly it is vastly more powerful than most other skills. You can buff a single weapon any number of times provided that the Sacral Weapon skill is a different level, which means you can have Sacral Weapon, Sacral Weapon II, and Sacral Weapon III (for example) all active on the same weapon at the same time indefinitely if you want. That's a *lot* of extra good stuff ness (not sure what exactly the skill does but I'm pretty sure it makes your damage insane and the extra damage bypasses piercing damage resistance. This is particularly weird because Sacral is one of the few skills you can train. Just hold down the 'Sacral Weapon' key and you'll quickly find both that action and the Sacral skill levelling up like crazy. It does cost a lot of food and water, though, so that's why I'm not sure this is a bug.
5) Sometimes the game just crashes. Mostly happens when I'm attacking, mostly with ranged weapons. Is pretty rare and crashes don't generate a morgue file so I don't have enough information to really guess at what's probably going on here.
6) Arrow stacks split if some of them are in a target while the rest are identified. Lets say you have 10 unidentified +1 arrows you are using to fight a goblin. You shoot 3 into the goblin and he dies. Your arrows are IDed. You pick up the arrows you shot off the corpse and they are still not IDed. A couple turns later they are IDed as well, but they still can't stack with the previous ones they were a part of. You forever now have two stacks of +1 arrows from the same depth. Sometimes they are also assigned to the same key, because they are the same item, but one of them at random will always be the one the game selects first by that keybinding.
7) When you move by clicking the pathfinding is pretty good, but rarely it will move you into a chest. If it does, it's Game Over cause you ain't ever getting out of that menu screen. Worse still, you can't actually die since you can't exit the menu screen for more than an instant and no time passes when they automatic movement reopens the chest, so the game is softlocked and you have to close it. Worse still, you can't close it normally because the game is programmed not to allow the 'X' button on the window to be pressed nor to accept program termination commands in most of the normal ways. You must instead open task manager and end the process (on windows).
8) You can enter stairs even if you can't enter the space they are on, which is pretty cool. Sometimes when a part of the stair's walls are chosen to be secret doors or they spawn diagonally included in another room you can use this to explore the dungeon much more efficiently, preventing you from having to backtrack all the way to the stairs so long as you can hop diagonally in through a crack in a wall.
9) You can 'd'rop cursed items like they're no big deal, even though you can't un'e'quip them or equip other items over them. Considering I'm not sure how else you'd ever get rid of them unless they are a melee weapon (slimes) or ammo (shoot it or slimes), this might not be the worst thing ever.
10) I can't 'A'dmire my gold D: I tried pushing 'A' but no matter how much I push it nothing happens.
11) some firing angles let you shoot columns or a wall instead of your target, letting you train up your ranged weapon skill many points for all those misses until your target wakes up and moves. Sometimes you can empty your whole 40+ arrow starting quiver that way before that happens, though it's pretty rare to get that lucky, Just make sure you can get to the arrow pile afterwards before you actually have to fight something.
12 a) Books of Slide Away (and upgraded versions) don't do anything if you already know Slide Away.
12 b) Books of Hack and Slash pop you up to Hack and Slash VII if you already know Hack and Slash (which you do).
13) UnIDed objects are often pretty obvious in their effects. If it's armor and you have a non-magic piece of that armor the magic one won't compare against the non-magic one but the non-magic one will compare against the magic one just fine.
Do you have a better place to send bugs? I don't wanna bother you with too much information ^^;;