After I installed your plugin at the system level, and enabled it for one of my projects, I get an error from trac upon looking at any trac page linked to that project:
Error
TracError: OperationalError: duplicate column name: comment
Editing trac.ini to remove the worklog plugin enable statements fixes the project. Other enabled plugins are:
autoupgrade.autoupgrade.autoupgrade = enabled
batchmod.web_ui.batchmodifymodule = enabled
childtickets.admin.childticketsadminpanel = enabled
childtickets.childtickets.tracchildticketsmodule = enabled
coderev.api.codereviewersystem = enabled
coderev.web_ui.changesetticketmapper = enabled
coderev.web_ui.codereviewermodule = enabled
coderev.web_ui.committicketreferencemacro = enabled
mastertickets.api.masterticketssystem = enabled
mastertickets.web_ui.masterticketsmodule = enabled
simplemultiproject.admin.smpadminpanel = enabled
simplemultiproject.admin_component.smpcomponentadminpanel = enabled
simplemultiproject.environmentsetup.smpenvironmentsetupparticipant = enabled
simplemultiproject.milestone.smpmilestoneproject = enabled
simplemultiproject.model.smpmodel = enabled
simplemultiproject.roadmap.smproadmapproject = enabled
simplemultiproject.roadmap.smproadmapprojectfilter = enabled
simplemultiproject.ticket.smpticketproject = enabled
simplemultiproject.timeline.smptimelineprojectfilter = enabled
simplemultiproject.version.smpversionproject = enabled
tracbzr.backend.bzrconnector = enabled
tracbzr.backend.bzrpropertyrenderer = enabled
tracbzr.backend.bzrwikimacros = enabled
tracopt.ticket.deleter.ticketdeleter = enabled
tracrpc.api.xmlrpcsystem = enabled
tracrpc.json_rpc.jsonrpcprotocol = enabled
tracrpc.search.searchrpc = enabled
tracrpc.ticket.componentrpc = enabled
tracrpc.ticket.milestonerpc = enabled
tracrpc.ticket.priorityrpc = enabled
tracrpc.ticket.resolutionrpc = enabled
tracrpc.ticket.severityrpc = enabled
tracrpc.ticket.statusrpc = enabled
tracrpc.ticket.ticketrpc = enabled
tracrpc.ticket.typerpc = enabled
tracrpc.ticket.versionrpc = enabled
tracrpc.web_ui.rpcweb = enabled
tracrpc.wiki.wikirpc = enabled
tracrpc.xml_rpc.xmlrpcprotocol = enabled
whiteboard.web_ui.whiteboardmodule = enabled