Try this: create the following tiddlers. Using this you store the task status as a tag in one tiddler (taskmanager)
title: "taskme" text: <$checkbox tiddler="taskmanager" tag=<<currentTiddler>> > {{!!title}}</$checkbox> title: mytasks text: * {{What am I doing?||taskme}} * {{I have some time||taskme}} -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/fa91f7d4-1426-4f20-abf8-7f5820951e43%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.