Comment # 8 on bug 947593 from Roman Bysh

The reason for disabling the "Distributor field" in the gui/ncurses version of
the Yast Boot Loader is an unrealistic reason for removal when using a
text-based tool such as zypper.

Why not remove the gui fields for "Vga mode" or "Console resolution"? You can
always edit and add them to the "Optional Kernel Command Line Parameters"
field. 

It's the same difference. You are penalizing the functional gui use field on
the Yast Boot Loader because there is a limitation of a text-based installation
tool.