Add higher values or “Maximum Width” option to the Custom Tab Width flag

[vxsp]

It would be great to have more options with the #custom-tab-width flag.
Currently, the highest available value is 400

I use 400 because it allows me to see full titles and looks cleaner
However, an option for a maximum width (or just extending the range up to ~800) would make it much more customizable.

Suggestion:
• Add a “Max Width” mode where the tab expands until it reaches a certain limit.
• Or simply extend the predefined options (e.g., 500, 600, 800).