Latest firmware comes with screen version 4.00.03 - which does not support vertical split panes. Version 4.0.1 and above do. Opkg repo has version screen - 4.0.3-r1.5. But when I try to upgrade, the system will not let me:
openpandora:~$ screen -version
Screen version 4.00.03 (FAU) 23-Oct-06...