When I first started on Arelith a couple of years ago the thing that caught my attention the most was the vast number of languages that could be learned. I would say this is my favorite game mechanic on the entire server and at that time I had questions about how it worked--because I was new. The one thing that annoys me the most about the language system is that you can take everything to 99% so you can understand/speak with everyone. I would like to see this fixed as it's a cheesy metagame oversite. I would actually like to see language % decay over time if you are not actively HOLDING the book in your inventory (not in a bookbag) IF you are not fluent. Fluency should lock it in.
That said, I would love to see it changed and rewards given to people that ACTUALLY go 100% in a language they learn. May it be you get special repeatable quests from NPCs that handle writs that give you items based on language and location.
I.E.
Dwarven - Random roll for all ore types; 1d3 chunks (adamantine on the list, but low chance)
Halfling - Random roll on herbalism items.
---Doesn't have to be limited to the racial trade point each race has, just an example---
Maybe there is a wandering merchant (random race/location but appropriate for location; so no random ogre merchant showing up in Cordor)
Since you speak his native tongue he's happy to do business with you and has access to things you normally wouldn't be able to buy.
They should show up to the same place each time and rotate out every 45m - 1h. Randomly of course, so a chance that one doesn't show up and a chance that one comes in as the other one leaves.
Fluency in a language should have a special perk related to it.