Alright, so a few things you can do:
Go to View > Settings and change the option which says "Disable Chrome as Internal browser" to the opposite of whatever it is on. Then restart Swiftkit, hopefully this fixes the centring problems.
If you want a little more space at the bottom you can always hide your task bar (the thing with the windows logo) or move it to the side by dragging it there.
And finally, probably the most useful tip, if you go to View > "Show right side tools" and "show bottom tools" you can hide both of these tools to make RS fit into the screen.
You can also go to Utilities > IRC Client to get a pop out irc client.