My thought is that you cannot control with which FeatureLayer a custom Construction Tool can be offered in the Construction Tools pane of the Create Features dockable window. It seems that the only reason why a custom Construction Tool displays is because:a) that Construction Tool has been registered with a given ESRI Editor Construction Tools component category--e.g. ESRI Editor Point Feature Construction Tools or ESRI Editor Annotation Feature Construction Tools component category--which is determined by the developer in the source code of the construction tool.b) the enduser has selected a feature template associated with a feature layer whose geometry type corresponds to the geometry type of the editor construction tool.So if an enduser selects a feature template that is associated with a point feature layer, ArcMap will load all the classes/tools that are registered in the component category called ESRI Editor Point Feature Construction Tools in the Construction Tools pane of the Create Features dockable window. This is similar to ArcMap loading all the classes/tools that are registered in the component category called ESRI Mx Commands in the Commands tab of the Customize dialog, which one can then drag onto any toolbar.I think you found a good workaround which is to disable that tool with the Enable property of the BaseCommand class. That even falls within the expected behavior of all ArcMap tools/commands (built-in or custom) which is for the tool/command to be disabled if the criteria for using it has not been met, e.g. when the Select tool becomes disabled because no feature layers have yet been added to the map. Such tool would not disappear just because its use does not apply--rather, it becomes disabled.If for example your construction tool is for using with a point feature layer, is there a specific reason you do not want to offer your custom construction tool with all point feature layers? Will your "point" construction tool run into some trouble if it is used with a point feature layer that does not have a certain attribute field? I can only think of the fields being a problem because your "point" construction tool should apply to all point feature layers.