Sony Ericsson Xperia X10 :: Connecting To Internet Via PC - When Connected By USB

I have a Xperia X10, great phone ! but some issues.

1) It seems to use loads of data even when i am not actively using the phone, and i have disabled google's background data setting. I would stop using the phone with the 3g connection on and my NetCounter app would say 2,5mb used , i would sleep and wake up and it would note 23mb used for instance. Does this phone send background info to SE and Google over and above what we can control in the settings. As i live in South Africa , our internet browsing cost are high even via 3G and this seems extreme. What should a average user be using in a month? ( ?MB)

2) The next issue blows my mind. Due to the fact that i used to have a SE p910i and it did connect with ease. The Experia seems unable to connect to the internet via the USB cable. It does connect to the PC to trf. files and music , photos etc , and it can use the internet via PC (connected to LAN) to do an update. Yet with my phone connected to PC i cannot simply use LAN through PC to browse on the phone. I know the phone is aimed at mobile connectivity via 2/3G and WiFi, i get that. But if my phone is connected to my PC most days when i am in the office ( it charges like this obviously) then why am i forced to use 3G or wifi, it seems odd that such an "amazing" phone in constrained like this. So if i want to browse the Android Market while connected to PC i am forced to use 3G or connect to a wifi network to do this , thus having to pay for data , that would otherwise be accessed if i could get access to the LAN.

Please can someone explain why an advanced handset, "smart" phone cant seem to do , what most handsets prior to these fancy touch screens could do. I mean i had a Samsung Omnia and decided to go back to SE, the Omnia could share its internet connection with my PC and it could also connect to the internet via the USB ( access LAN via PC)

SE dont you think it is embaressing that clients have to bring up issues like this. For all that android is , it seems more limiting in my experience so far , having used the X10 for 3 months.

SE please suprise me with some options or at least news of an update that can remedy what i would call an embarassing oversight. I think the Windows OS phones do this in their sleep.