You can choose the items before CrossPiece command call. But if you want to call a program options, you must first deselect all objects and then call the CRS. You can select two or more solids simultaneously. The selection could accidentally get any foreign objects - it is not scary. The program will only work with Solid. In the process of selecting the items you see in the console 3 options:

• Inverse - this option allows you to change the direction of pulling out of parts from the slot. To be specific, first recommended to select 1 solid, enter this option and press enter. You will be prompted to choose the second solid.
• Gap - the program will ask the size of the gap, which should be left between the items for free movement. The gap is recommended in cases when you are not sure that your production will receive the exact material thickness as you drew. For example, suppliers of particle board can afford the sheet thickness from 15.8 to 16.5mm. In this case I recommend a 0.3mm gap. This gap will be placed on each side of parts. Thus the groove is 0.6 mm wider than the parts. Those you can say you have entered number doubles.
• Backlash - This option also creates a gap between the parts, but the gap will be made only at the ends of the cutouts. This will allow the details to be pushed into the cross deeper that they are located in the assembly. Usually, this gap is used to compensate the diameter of the milling cutter, which parts are made on the CNC milling machine.

The program is designed for only a limited number of components and connection methods. The main surface of the parts should be flat; the ends of the parts should not overlap with each other. In some cases, the geometry of solids is so complex that further processing becomes impossible and Autodesk® AutoCAD® show error eGeneralModelinglFail. This is not a fault of my program. You can try to redraw such solid again.

When the parts are drawn a little out exactly program cannot understand way of dismantling cross-piece. In this case you can see: one part likely surrounds another. To help program just move items in the direction of dismantling cross-piece at least a little bit.

If more than 2 parts are joined by crosspieces, the program will try to make cutouts from the same side of the part to disassemble the crosses in one direction. But if this program does not succeed - help program just move items in the direction of dismantling cross-piece at least a little bit.

Program always set History=Non for all solids.

Settings are stored in the Windows registry under current user. 

Follow the messages on the console. There may be program messages.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

Updates

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If you have an interest in the new version, just download it from my website and unzip into the same directory with the replacement of all files. AutoCAD course must be closed.

Updates are free. Reactivation not required.

In some cases, the geometry of solids is so complex that further processing becomes impossible and AutoCAD shows the error eGeneralModelinglFail. This is not a fault of my program. You can try to redraw such solid again.