Can't connect more than 2 spline nodes at a time

[gompert]

I have multiple splines and I'm trying to connect all of their root nodes (the idea is that the user can traverse several distinct paths from a single starting point). However, after connecting two nodes, the 'Connect Spline' button is greyed out when I select either node and a third, unlinked node. In fact, I can't seem to connect a third spline to any node of the two connect splines. Is this a limitation of the script, or am I missing something?