I want create custom color picker by script, but i can't?

[endlesstravel]

hi ! i like aseprite and it awesome work.
I want to customize a color window, but the current script is so weak, I can’t do it.

like this :

if i have one of them implement, i can do that :

1. make a way to custom widget just like :

     local dlg = Dialog()
    dlg:custom{ id="xxxxxxxx",
                 width=500,
                 height=200,
                 onDraw=function(w,h, mouseStatus, keyStatus) .../*draw invoked*/..... end
     			}

2. make way to create a timer :

  -- Prevent secondary creation
    if app.timer["timer 1"] == nil then 
        app.timer["timer 1"] = { ,
                onTick=function() ..../* maybe cross-thread operation */..... end, -- update each frame
    			}
    end

in this way, i will create a window outside.