Mouse wheel scrolling in less and vim using urxvt

Mouse wheel scrolling in less and vim using urxvt

I have started working with rxvt-unicode (aka urxvt) but found an issue with mouse-wheel scrolling, as compared to gnome-terminal and konsole. The mouse wheel works fine for going through the scrollback buffer, but it doesn't work for automatic scrolling in less/most or vim (though in vim, setting mouse=a makes it work, but in a very different way, which I don't have to do with gnome-terminal/konsole).