The ability to add and configure keyboard shortcuts in TiddlyWiki is the gift that keeps on giving!
I would like to float a suggestion about the built-in shortcuts for linking, however:
In Windows world, CTRL+K is usually the keyboard shortcut for creating a hyperlink (at least in text editors and in the text areas of most programs I've come across). One of the first things I did when I discovered I could now configure shortcuts in TW was change the Linkify shortcut to CTRL+K and the Link shortcut to SHIFT+CTRL+K.
I don't know that I've ever seen CTRL+L or SHIFT+ALT+L trigger any kind of linking behavior in Windows. Unless there are conventions I'm unaware of, I'd recommend making TW's out-of-the-box shortcuts for Linkify and Link CTRL+K and SHIFT+CTRL+K, respectively.
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I might also recommend a minor edit to the hint shadow tiddlers for each shortcut to prod users in distinguishing them in the control panel.
Perhaps:
Wrap selection in square brackets, e.g. `[[link]]`
... for Link.
And:
Create wikitext link, e.g. `[[link|destination]]`
... for Linkify.