sessions management and problem with touchpad when pressing "exit" at session choice screen

Hello to all!
I have one question and one notice about new session manager in updated xubuntu (12.04 beta) .

Don't telling you what i done and what i wanted to do. I've already look through settings and manuals, but there is some things i still want you to tell me.

Does to load previously saved session means just to open same applications at same positions as how it was when i logout? All global settings, auto started applications, panel settings and etc. will be the same in all saved sessions?
How to delete saved session? There is no option to do this. What means all these files placed in "/home/*my name*/.cache/sessions" and can i safely delete unnecessary sessions by manual editing "xfce4-session-*my name*:0"?

And i have one notice, may be it is a bug. If i press "Exit" on session choice screen my touchpad becomes unfit for work, even after i log on. Cursor can be moved only with two fingers and it twitches very often.