shortcut to send selection to terminal in geany
By default there's no such shortcut defined but you can easily assign a new one.
Open the Edit -> Preferences (Ctrl+Alt+p) menu and click on the Keybindings tab:
Scroll down into the "Format" category to find and select a "Send Selection to Terminal" action. Click the Change button to assign a new shortcut and you can now send your selection to the VTE Terminal: