It turns out that creating plugins for DroidScript is easier in AIDE than the Eclipse projects recommended by the DroidScript developers.
A user of both DroidScript and AIDE has put together a DroidScript project that has an option to create a skeleton AIDE project for writing a DS plugin.
Once AIDE has been used to develop the guts of the plugin and an apk has been built, another option in the DroidScript project converts the apk to a DroidScript plugin and installs it in the local copy of DroidScript.
Details of the plugin builder are at
https://groups.google.com/d/msg/androidscript/NgsEdMST6HE/y-miUeVdAwAJ
Please note, both DroidScript and AIDE need to be installed on the android device before using the plugin builder.