StickyKeys accessibility option in Windows makes it possible to invoke multi-key keyboard shortcuts by pressing one key at a time. StickyKeys support can be enabled for HTML-Kit shortcuts as described in this FAQ.
The tiny Workspace icon on the bottom left corner of the HTML-Kit window can be used to toggle the Workspace window on and off. This document describes how to create and use a keyboard shortcut to do the same.
XML documents tend to use longer tag names to improve readability and to avoid versioning conflicts. The amount of time spent on typing XML and HTML tags can be reduced by using this keyboard shortcut to close tags.