I have a workaround for quick access brushes/tools, make a template.ptg file that has certain tools always used in the toolbox panel there. Open the file, minimize the tool picker and just use the tools from the toolbox (mine include a selection of oil brushes, custom brushes, and the customized palette knives that I generally reach for all the time). I almost never open ArtRage from the icon anymore, just through that template file.