0.15 supports fee estimates up to 1008 blocks It would be great if someone could add support for this to the GUI with a redesign of the slider. My recommendation was just to make the slider have discrete values such as: 2, 4, 6, 12, 24, 48, 144, 504, 1008
Do we really need more fee choices than that? But perhaps someone with more QT expertise could whip it up faster than me