You might not like the default keyboard bindings that are present in LilyPondTool Virtual Piano. You can easily redefine them in the menu Plugins>Plugin Options>LilyPondTool>Virtual Piano.

Click on the binding you want to redefine, then type the binding in the appearing dialog box. Press OK to set the new shortcut for the action, then press OK on the Plugin Options dialog box to save the new settings.