Check original README of vscode-which-key first

Adds TMUX-like keybindings (your need to create "whichkeytmux.bindings": and whichkeytmux.transient in settings.json)

You can add quick open delay with apc extension:

"apc.stylesheet": {
    ".quick-input-widget.show-file-icons": "transition:  opacity steps(1) .4s, display 0s allow-discrete; @starting-style {opacity: 0;}}"
},

It's also better to disable tabs in editor groups, close your explorer view, and just use ⌘+P or Harpoon-like extension for tab management:

"workbench.editor.showTabs": "single",
"workbench.editor.limit.enabled": true,
"workbench.editor.limit.perEditorGroup": true,
"workbench.editor.limit.value": 1,

You can check my configs here (WIP): https://github.com/wtf403/.dotfiles/tree/main/vscode