The paragraph for Enter and linebreak for Shift+Enter is our preferred method since it is the same as traditional editors.
Oh sorted .. I think I'll leave my fiddling again until tomorrow .. I think you guys are probably hard at work doing stuff whilst I am too, so we may be getting problems being fixed whilst I'm still in the process of reporting .. lol
It's something we can look into. I've just set up a Uservoice forum so we can better track requests/bugs/issues with the new functionality, which can be found here: http://guildlaunch.uservoice.com/forums/275221-guild-launch-v5-feedback
Do you mean the site wide text size? This would be editable via custom CSS for now. The text size was selected based on current best practices are you having an issue with it?