Some options were missing so they could not be set
in the rdp template.

Closes: #78

The clim `preferred_username` is optional in Azure AD. Although is listed as preferred, in some enterprise environment it's not possible to add this additional claim. `unique_name` and `upn` are legacy alternatives

If using the filesystem storage provider
for session store it can be set than a larger value than 4kb
as it is not tied to the restriction of a cookie anymore.