Just in the scroll itself? or permanently? the problem with low Le isn't that you can't determine the amount of charges per se, it's that you can't remember it.

I was thinking permanently but now that you mentioned memory and it's relation to learning attribute, I see it differently.
I have always assumed that inability to determine how many charges a wand has was related to the character's skill with magical things in general.
Then again, wands can be used and most chars will remember how many charges each still has so it's related to memory and the ability to remember learned information.

The problem here is that for example, you can still remember exactly how many castings you have on any of the 30+ spells available. Or the exact type and order of traps around mana temple. Or the amount of gold you're carrying, that can go into hundreds of thousands of gold pieces, etc.
I see big inconsistency here, where your character can apparently remember large numbers about a lot of abstract things yet can't remember something as trivial as the single digit of charges on wand(s) in inventory.

I recall reading that in the gamma days, very low Learning affected the PC's ability to remember most numbers (including the amount of items on a stack), but over time wand charges proved to be the only thing that could be affected without making the game frustrating.

Would be cool to have the inventory look something like 'a bunch of missiles' instead of 'x missiles' for low learning chars ( for example: few=2-5, one should be one and then for more than 5 there can be different words, like in HoMM games for amount of monsters).

After reading the above i see that it is poorly written, but my poor english doesn't allow me to explain myself better.

I know exactly what you mean, I play HoMM3 regularly.
This is a nice idea but I was thinking that now that we can add notes to items, all of this is pretty much obsolete.
You could count the missiles one by one and just add a note informing you how many are there.
I normally don't play chars that have small enough learning score to be affected by these memory issues so it's not a problem for me.
I do however think that for the sake of consistency, something should be done about wands with unknown charges.
Scroll of greater identify feel like the right solution here.