Because is possible have large lists (i.e. 200 events in timeline) i think woud be very usefull :

  *  Keep the toolbar fix at top, ever visible; and/or
  *  Have button(s) to top

This is easy to do through the CSS editor. I don't think that Fossil needs to be a presentation/layout engine, so it's probably best just to merge these with the existing styles:

<pre>
body {
  padding-top: 2em;
}

div.mainmenu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}
</pre>

Tested in Safari and Firefox.