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Some kernel options, particularly the kickstart URL are slightly cumbersome to type or copy+paste for each setup. Previously, the kickstart URL had its own combo-box that remembered options entered. Now that the kickstart URL combo-box has been deprecated, please change the kernel options text entry field into a combo box that saves previously used options.
Sorry this didn't receive a timely response. If someone showed up with a patch to add this to the UI, I would not be opposed to it, but this is not something I'm planning on adding to the UI at this point. If someone needs kernel options enough that this is really beneficial then IMO they may want to use virt-install which you can write once and template easy enough.