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The dexterity bonus to AC shoudn't stack with armor. Now that BG EE differ from where each bonus/penality comes from for Thac0/AC/Damage, maybe the core rules of D&D could be respected, by limiting the dexterity bonus value based on the armor a character uses.
I see this as a bug, but as i think that it was intented to be this way on the past, it's probally something to change more than a bug to fix.
This would also make other armor kinds to be more valuable and would bring diversity to the game. Atm when i can i use a full plate mail and a ring/cloak+1 (+2 when i can), to low strengh characters i use ankheg armor or the full plate mail+3 from durlag's tower and that is, the rest of the armor i found become gold fodder.