That's definitely a rewarding exercise and it won't take you long to arrive at your desired solution(s). Not that I'm saying "don't read the docs" but you know you'll get answers around here.
Anyhow, one powerful approach to get the right tiddlers quickly at your fingertips: use exotic prefixes, e.g. :missing, :archive, :whatever... then go to the search box and enter nothing but
:. The one thing I am missing the most is that I can just hit the down key, select the desired entry, hit enter and see it open. Something like what GotoPlugin did in TW2.
For example, go to
tbGTD and just enter
# into the search bar, then hit the down key. That's what I mean. No fiddly tabs, no scrolling, no nothing. You don't even have to reinvent the wheel, simply transclude the corresponding shadow tiddler... usually they go by the name, so if you use your browser search while in the shadow tab to look for missing, you'll find
$:/core/ui/MoreSideBar/Missing ...simply do
{{$:/core/ui/MoreSideBar/Missing}} in whichever tiddler is easier for you to find and voila.
Or, create some custom
:tools tiddler or whatever... where you list all other things that you want quick access to... and that you know... rather than wade your way through tabs, doing scrolling.