Hmmm... Let me try that again:
Petrosian: "Read simply for what it sayd, this is saying you CAN use the weapon finesse feat for the dagger. This is not saying you GET the weapon finesse feat for the dagger.
read simply what is said and don't "divine" or "derive" out of it what is not there."
Me: I didn't add ''get.' English is complex, and 'can' can easily mean 'enable' or 'activate' in this context. You obviously don't actually 'get' the feat, it just reads (to me) like the dagger can be modified by Dexterity rather than Strength.
Petrosian: "Probably because someone decided they wated to highlight this feature. possibly because, as tiny, the dagger works as such for any PC sized race, whereas the light mace will only work with finesse for some."
Me: That's a good point. I considered that possibility, then discarded it when the didn't grant the tiny punch dagger with the same qualities.
Petrosian: "And thus you learn the true value of threads on rules. you get exactly what you pay for."
Me: True enough. And then some. You guys are kinda harsh. I'm sure the word 'munchkin' gets thrown around a lot on the rules board; I just don't think that it applies to a player who makes a character who is proficient in longswords, greatswords, and shields but uses none of the above because they like the idea of a character that stabs monsters with a 1d4 knife...
I'm not arguing the rule anymore. Consensus opinion has weighed in, my DM will adjudicate the matter fairly, and I'll probably be dropping a feat to buy Weapon Finesse (dagger). I'm only saying that the PHB is worse than ambiguous here and the sad result is that I've got a character who has been using the dagger in an apparently illegal fashion for a year now.