If you consult the docs directly, you'll see all available tyFlow objects listed in the left menu:
https://docs.tyflow.com
I don't think a giant list/menu of all tyFlow objects is something I'd add to Max anywhere myself (I'll continue to just allow users to code such panels on their own, as you found). Conforming to the create panel conventions (tyFlow objects are listed by category, under the "tyFlow" label) is important to maintain consistency with other plugins and align with user expectations. The one exception is a tyFlow object itself, which is listed under Standard Primitives instead of the "tyFlow" label, so that it's more immediately available.
https://docs.tyflow.com
I don't think a giant list/menu of all tyFlow objects is something I'd add to Max anywhere myself (I'll continue to just allow users to code such panels on their own, as you found). Conforming to the create panel conventions (tyFlow objects are listed by category, under the "tyFlow" label) is important to maintain consistency with other plugins and align with user expectations. The one exception is a tyFlow object itself, which is listed under Standard Primitives instead of the "tyFlow" label, so that it's more immediately available.