"cryptoswitcher" is a special program you would need to install on your computer (correct me if I'm wrong), so it would only control the local CGMiner and all responsibility is on you (a person who runs this program).
My site, on the the other hand, can control any cgminer connected to the internet, so no software needs to be installed. I don't want to deal with extra security which comes with storing your API keys for the Exchange inside the database. There is much more financial risk involved, if I try to trade remotely on your behalf.
I do take latest prices from BTC-E and other Exchanges directly, but I do my own calculations of profitability based on 3 values: block Reward, Difficulty and price. So, my tool might switch miners much quicker than cryptoswitcher (they just take profitability from other sites). For example MNC profitability goes up only for 7-10 minutes and then it goes back below BTC for 30-40 minutes.
So, I don't have plans to implement auto trading because I think it is a different tool, which has very little to do with mining most profitable coin. Especially when there are trading bots already available - just set them up to sell you coins as soon as the are transferred to the exchange.