Not in the game proper, but using the console and player.setav does work.
Be sure you keep the total number of points you've spent the same to avoid cheating. Remember that skills start out at 15, so don't drop anything below that.

It would be nice if she marked it on our map or something. I got side tracked doing other quests, and afterwards I couldn't remember where she'd told me to go. (The quest was completed, so that didn't help.) If not for the troll bounty quest emptying out right nearby, I never would have found it.

Yes, it can be a bit confusing. However, this is how it should work: On the same level, where the river runs into the sea is farm where you found the boy. Behind the farm, in western direction is a mountainous area and atop of one mountain - quite good to see - is a large bare tree. Climb up there ...

How strange. Perhaps adding another layer just under the missing one would help? As long as it doesn't vanish too, it would prevent those of us with the glitch from falling at least.

I have submitted a ticket.

Some of the ground outside the exit of the Shimmering Grove is missing. I had to toggle collision using the console to get out after falling into it.
I don't have any mods installed, so I don't think my system caused it. Has anyone else noticed something similar in that area?

I'm apparently not that good at riddles. My current riddle and what I have attempted so far below: "At the beginning of the current, in the west a grand stone with an elevated, bare tree." I figured the first bit meant either the river mouth or the river's source, so I poked around up and down the t...

Ah, I figured out a way to do it actually. The player.setav console command works just fine, despite some of the abilities being renamed. I used it to shuffle those couple of points over to another skill.
I'll be more careful about what books I read in the future.

Not even a console option? Man, that sucks. I really don't want to replay so much...

I foolishly ended up reading every book I found while exploring before realizing it was using up my learning points. Is there any way for me to respec my character? I'd rather not have wasted points in heavy armor and block when I've decided to duelwield daggers and wear light armor. A console comma...

I don't mind the lack of flying, but the missing quests are just tragic. Hopefully they can be implemented in the future, if not by SureAI then by other moders.