The frame title currently titled Lilo Configuration (which should be called Boot Loader Configuration) needs to gray out the LILO options if Install Bootloader is selected so it is clear which are LILO options and which are Grub options, and vice versa - the Grub options should be grayed out if LILO is selected. Also, Install boot loader should read Install Grub boot loader so that it is clear which you are choosing.
This screen is pretty bad on the whole.
Also it is impossible to select default preffered boot image by clicking on the apropriate line (with this image). One must select proper line and then click in the other dialog line above (something like 'select this as default image'). A little bit... non-intuitive :-)
Yeah...like I said, this screen needs a facelift. Badly.
Please work on a glade mockup of a better layout. I don't want to have to change the glue code for the screen - just try rearranging and maybe adding some text to the screen to make it clearer.
I have made some minor changes that should help a little. There's not time to fix it properly at the moment.