I pretty much agree with Akira, expandable chip mem would have been a cool idea. Additionally, shipping it with some FastRAM would have made a difference speed-wise.
An optional internal scandoubler would have been great too. I don't think that the A1200 (main target audience=gamers and "low budget people") should have been shipped with mounted Amber chip. Just adds to the price tag, while most of the target audience won't buy/need an expensive VGA monitor right from the start.