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Is it possible to choose what dynamic objects are available as options to an admin?
One way would be to comment the relevant section out of apps/app/conf/embed.php.
ie, if you don't want blog headlines, you could do this in apps/blog/conf/embed.php:
; label = "Blog: Headlines"
; icon = rss
; tag[label] = "Tag (optional)"
; tag[type] = select
; tag[require] = "apps/blog/lib/Functions.php"
; tag[callback] = "blog_get_tags"
; dates[label] = "Show dates"
; dates[type] = select
; dates[require] = "apps/blog/lib/Functions.php"
; dates[callback] = "blog_yes_no"