Hey Amadeus
Which specific Title are you working with? It sounds like you are using one that does not publish those parameters. Have you tried using an alternate Title template as the basis for your animated effect?
For what it's worth, the basic design principle behind the Effects / Titles / Generators etc built into FCP X is to keep the controls as simple as possible (this is a dictate from Apple's ProApps devlopment team) ... so I'm thinking that if you need to do something beyond the scope of the built-in tools then you might want to consider using Motion 5 instead ... you can use Motion to build and control far more complex effects than is possible directly in FCPX, plus you can also publish the finished effects you've built as templates, right back in to your FCPX install. Its cool.
Hope it helps
Andy