One of my ISSW colleagues drew my attention to this.
$ /opt/IBM/InstallationManager/eclipse/tools/imcl uninstall com.ibm.websphere.ND.v70 com.ibm.websphere.XML.v10 com.ibm.ws.WBPMSTD_7.5.1001.20120915_1227
It's possible to use IBM Installation Manager, via the command-line, to perform a complete uninstallation of a set of WebSphere-based products, without needing to generate and use a response file.
So here's me uninstalling IBM BPM 7.5.1.0, plus it's underlying co-requisites: -
Remove the WAS Profiles
$ /opt/IBM/WebSphere/AppServer/bin/manageprofiles.sh -deleteAll
Uninstall BPM, XML Feature Pack and WAS ND
$ /opt/IBM/InstallationManager/eclipse/tools/imcl uninstall com.ibm.websphere.ND.v70 com.ibm.websphere.XML.v10 com.ibm.ws.WBPMSTD_7.5.1001.20120915_1227
Uninstall IIM
$ /opt/IBM/InstallationManager/eclipse/tools/imcl uninstall com.ibm.cic.agent_1.6.2000.20130301_2248
Sweet :-)