You can get a title safe cage generator from Digital Heaven (which is in the UK, BTW)
It's called DH widesafe and it's about $10. I use this all the time to keep my titles 4x3 safe inside the 16x9 space. Check it out here [
www.digital-heaven.co.uk]
As for your 14x9 problem - this is harder to figure using words. Its so much easier to sit in front if this to actually see what is going on. You could try physically stretching the picture in the canvas using the wireframe function and seeing what numbers it gives you in the motion tab. If you stretch all the way to the edges horizontally you should get the correct ratio.
Possibly you should hook up with Digital Heaven over there - they are well known for their FCP expertise.