Instead of using 'editorTemplate -addControl' to create default controls, use 'editorTemplate -callCustom' to specify scripts where you can create the controls yourself.
For example, for a color control you could use 'attrColorSliderGrp' control to create the same type of control as the default. 'attrColorSliderGrp' has a '-showButton' flag which determines whether to show the texture button or not. By default it is shown so you would have to specify '-showButton off' to disable it. E.g.
global proc my_newColorAttr(string $plug)
{
string $attr = match("[^.]*$", $plug);
string $ctlName = $attr + "_ctl";
attrColorSliderGrp -at $plug -showButton no $ctlName;
}
global proc my_replaceColorAttr(string $plug)
{
string $attr = match("[^.]*$", $plug);
string $ctlName = $attr + "_ctl";
attrColorSliderGrp -e -at $plug $ctlName;
}
...
editorTemplate -callCustom my_newColorAttr my_replaceColorAttr "color";
editorTemplate -callCustom my_newColorAttr my_replaceColorAttr "diffuseColor";
...etc.I haven't tested the above code so you may have to fiddle with it a bit.
