Hello,
Some good feature requests here, specifically the one about the ability to add notes to various items.
You're better off grouping together like features into their own posts - big lists of features will just get lost.
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Individual vs MSP mode (Show/Hide "Clients")
We have this, kind-of. You can set the home-page when you login to go to a specific client page.
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"Related Items" ability to link things together for ease of navigation
This is already in progress across many sections of the app. Additionally, the "Services" page will ideally be where things are tied together. The intention is that you define a service (e.g. a custom app, active directory, etc) as a service and link all related items (assets, passwords, documents, domains, SSLs, etc) so that someone that's never touched it before has all the information at their fingertips.
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Fully customize what tabs are available (Enable/Disable each section so if not in use can be hidden - example Tickets)
Have you seen Settings > Modules?
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Alternative authentication mechanisms for admins (RADIUS, SAML, etc)
This won't be possible due to the way client logins are encrypted.