Hi,
My suggestion was over component heavy - bad idea, on the other hand I am not certain the LM3914 would be a suitable device for this purpose, the buttons apparently are spaced out 1.0V; 1.6V; 2.3V; 3.0V; 3.6V; 4.3V, or seen as differences then 0V +1V, +0.6V, +0.7V, +0.7V, +0.6V, +0.7V - the ten comparator trip levels in the 3914 are separated by a resistor ladder made up of 1Ks (according to the datasheet I have at least), and besides which the slow transition from output to output up and down designed for "nice looking" LED switching with no off moments may be not ideal for the purpose, but maybe that only happens in bargraph mode and not in dot mode.
The suggestion of biasing transistors, or the dual op amp design seem better, or what Tuppe said about using the ADC on the MCU.