No, for selling its still the same as before, completely depends on the buyers in the market. But if you wish to set up a trade through an advertisement, then the minimum amount required is 0.4 BTC.
But OP reported that LBC won't let him open a trade.
No as they want me to have 0.4 BTC in my Localbitcoin account to open a trade. The difference in my country is about $20 less if I sell the BTC.
There are 2 way to sell BTC on LBC, 1 is you yourself make an advertisement that you want to sell BTC and 2 is you search for buyers (who have their advertisement open) and they're looking to buy BTC.
Which method are you using OP? I think the 2nd method won't have any minimum and you can sell if the buyer is willing to buy a small amount.
I haven't traded there in a while so I don't know if they have modified the rules for the second method also.