I think much of what you're suggesting is already there. For example, after doing the first quest in Terinyo, you'll be directed to the Caverns of Chaos by the Elder or the Druid. There's also supposed to be an element of mystery to the game - some things are supposed to be hard to figure out (the Assassin Prince's clue about Filk's location is deliberately cryptic, for example.)

Do you have any specific examples of things that are insufficiently clear from in-game play?

I'd integrate all the stuff which currently requires look into manual right into the game. Say skill and spell descriptions. I'd even give an option to display dices value ranges (e.g. 3d6+1 is 4-19) even though values from 4 to 19 aren't evenly distributed.

Another awesome thing which isn't coming in near future anyway could be item descriptions. Similar to monster memories with facts learned and well-known facts in ancardia. E.g. if you got a potion of quickling blood you could have a hint description that it might increase your speed. After driving a few potions you should probably know how much speed it could give.

Item descriptions are extremely hard to do in ADOM as each and every item is hand-coded (and not based on flags and structures in most aspects like e.g. in Angband). That's a historic problem but can't be easily changed.

Regarding this RFE: Please provide very specific examples of what specific information you specifically would like to see in the game :-)