New test build available.
http://www.dwedit.org/dwedit_board/viewtopic.php?pid=1740

SGB mode is restricted to using palette #0 only for now, I´ll add support for the tile attributes later.
For games which support both GBC and SGB, you can select which mode they run in.
There´s also a weird GBC+SGB mode which can confuse some games, like Dragon Warrior Monsters. That game will update the SGB borders even when running in GBC mode, but will sometimes reassign the palette to bad colors.