I was wondering if any of you could help me please?

I'm using AutoDisconnect and it does make a noticeable improvement on battery life. However, maybe this is a general N900 thing, but I've got some issues.

I have it set to connect automatically to any connection, but preferring wifi. However, sometimes the N900 chooses the MMS connection, which is of course useless for browsing the internet. Is there anyway to say, use all but not this connection?

The next thing is, does the N900 only connect to already known wifi networks, or does it attempt to connect to unprotected networks too?

Finally, and this is an AutoDisconnect thing, the idea of using Dual mode for a limited period of time is a good one, as you can save battery life and get a faster connection for a period of time. However, I'm finding that when the N900 switches the connection, the delay makes things timeout. So a website in MicroB will complain that there's no internet connection and make you choose it again, but as soon as you choose it, it switches to dual mode, momentarily disconnecting it, and MicroB thinks there is no connection again. Is there any way around this?

Many thanks.