This is a nice idea indeed, but it's hard to understand how it would work, so there's my idea:
What about adding a palmtop to the game, that will be able to be upgrades every three levels? (I know that's ridiculous, but there's one more option)
OR there should be disks scaterred over the maps that would work exacly like modules, and there should be only three of them in-game. (You don't find it, you lost it forever)
The palmtop would be nice in graphical version too, where instead of a black screen and letters, there would a palmtop pop out with green interface and eye-candy text. (For example when you level up, or when you want to check your inventory)
I think I might have slipped a bit out of the toppic by the last sentence, but even if I did, take that as a mini-suggestion for the current graphical beta version for improvement.