Aside from the other features heavilly requested for the Lindex page on the forums, which are:
Make the Sell Orders and Buy orders be side by side, instead of buys being ALL the way at the bottom, so that they're easier to see. And
Make it so that it's easier for people to see the sell/buy orders, without needing to go to advanced, so that people know they have an option to try to buy or sell for a better price (changing to advanced for trading is REALLY hard to find right now, too)
It would be really nice if it was possible to have the option to extend the "Trades In The Past 24 Hours" graph beyond the last 24 hours. The "High/Low/Average Exchange Rates" graph is too vague, and at times even very imprecise (it could show a large drop in the $L value for a specific day when the average gets offset by a large order placed well above everyone else, even when by the end of the day the value of the $L drops back to what it was the day before, or even declines). The part that's missing from the graph data, and why I would like to have the option to have the "24 Hour Trades" graph expanded, is being able to see the history of what time during the day do people usually buy and sell. I can't see this for yesterday, so unless I remember it, can't tell when is the best time to buy and when is the best time to sell. This would be a very convenient option, since if sellers can plainly see that sales pick up in the evenings (as they apparently do), they can hold off and sell most of their stuff in the evening instead of undercutting and piling up their sell orders one on top of each other, until they all get sold and the amount gets brought back down by the end of the day. Aside from being convenient, I think this feature would help to smooth things out a bit for people, and would further help to stabilize the market.
(then again, many people probably wouldn't even know how to read the graphs, so it may not help at all). Sorry about the long post. Just wanted to be as detailed as possible.