High Priority (target WP 5.8)

• Whole title styling options:
  • Bold, Italic (Add additional text formatting options to the site title block #31734)
  • Letter-spacing (Add Letter-spacing and enable this for site title and site tagline #31118)
  • Margin (depends on Dimension Tools and Controls #28356, fixed in Add margin block support to Site Title #31728)
  • Padding
  • Font-size and line-height Site Title: A few styling option ideas #23228, Site Title: Add text decoration and text transform controls #29622
• Make the Site Title icon more understandable Feedback: The meaning of the Site Title block icon is not obvious #30233
• Add option not to link to the site home in the frontend Site title: Add option to toggle home link #31540
• Normalize toolbar as explained in Adjust borders on block-level controls in the Toolbar #25983 (PR: [Block Library - Site Title]: Normalize the toolbar #30999)

Low Priority

• Full feature parity with Heading Block, with fine-grained styling options that require rich text Add rich text to the site title block #27830 Feedback: Site block text options are inconsistent #30727
• Add a link to the block description instructions to go to the described location. Site Title: Add a link to the block description instructions to go to the described location. #30871
• Ability to prepend/append text to the title, clarify consequences of changing the site title Site Title block: Ability to prepend/append text to the title, clarify consequences of changing the site title #30730
• Encourage users to make proper semantic decisions [Site Title Block] Encourage users to make proper semantic decisions  #29644