There's no way to resize the character panel at the moment. Perhaps if Turbine release us the new resources. You can sign a thread here
http://forums.lotro.com/showthread.php?381775
Lotro store button from the mainbar is removable. Add the following line under <Element ID="ToolBarButton_MainMenu" X="207" Y="138" Width="1" Height="1"> </Element>
Code:
<Element ID="Toolbar_WebstoreButton" X="1" Y="1" Width="1" Height="1" />