The arrow indicators flash and disappear when the keybindings are set to use the numpad keycodes:

require("collision"){
        --        Numpad keys
        up    = { "#80" }, -- numpad 8
        down  = { "#88" }, -- numpad 2
        left  = { "#83" }, -- numpad 4
        right = { "#85" }, -- numpad 6
}

Is it possible to get the arrow icons to remain while mod4 is held down when using the numpad for directions like it does when set to arrow keys or the vim bindings?

I have ctrl+alt+arrow keybindings with tmux and mod+{ctl,shift}+{h,j,k,l} for layout manipulation so using the numpad for collision would be awesome. It's usable without the icons sticking around but it would be nice to see those hints for longer.