This catalog provides an example of generating centroid connectors only using Voyager scripting:

communities.bentley.com/.../ex_5F00_centroid_5F00_connectors.zip

The process:

• check link directionality, and generate centroids in the right direction if connecting to one-way link
• does not generate centroid connectors to/from disconnected nodes
• generates centroid connectors to closest nodes, in subsequent order (the closest one, the second closest one, etc.), up to a max number of connectors that you impose 
• considers a distance threshold
• requires a node attribute that is equal 0 if no centroid connector can be generated to the node, or equal 1 if the node can be used to connect to a centroid (note that the script can be modified to work without this requirement) 

To use the tool, you need to select your input network (that can be in a NET or a GDB/MDB file), and all the other specifications in the scenario panel, then you just click "Run":

The Network program n. 1 produces the Links and Nodes table from the input network.

The Matrix program n. 2 is the core of the tool. The script generate and output the centroid connectors, on the basis of what you specified within the scenario panel in terms of options. 

The Network program n. 3 merge the input network and the newly generated centroid connectors, creating an output NET file (binary network, without geometry)

If the input network is in GDB format, and you have selected the option to generate a GDB in output, then the output GDB network is generated in Network program n. 5