Feature Request: Add a resolution for vertical shooters

[zal16]

It's possible to add a 480x640 resolution for use on vertical shooters (Shinkigami no Shiro II, Ikaruga, Under Defeat, etc...)? Because these games offer beter resolution quality and shapness if played vertically (selectable on options menus).

This resquest is for avoid the necessity to rotate phisically the monitor/tv to get the best resolution for this type of games.