I use Danielo's Keyboard snippets routine to do exactly that. I added this definition to the Keybindings file and it works like a charm.
"alt+F1" : [ {"exp":"^", "modificators":"gm", "replace":"| "},{"exp":"\t", "modificators":"g", "replace":" | "},{"exp":"$", "modificators":"gm", "replace":" |"}] -- 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 http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.