To assign two (or more) commands to a single keybinding, you’ll have to use the following syntax:
<keybind key="A-F4">
<action name="execute">
<command>thunar</command>
</action>
<action name="execute">
<command>osdctl -s 'Thunar'</command>
</action>
</keybind>
This will launch the file manager Thunar and prompt osdsh to display the text “Thunar” on my screen.