Odd.. i can use return just fine with 810 keyboard i would think the same would be true for bt keyboard... perhaps different keycode though since nokia might have reversed that with DPad Enter. Geany detects my dpad enter as 'Return' and my enter keypad key as 'KP_Enter'... separate key codes.

You could remap a key like Dpad Enter (Return) to be paste and then just copy a newline and use dpad enter for return as workaround on 800. You'd do that in help menu/keyboard shortcuts.