Ubuntu gets its list of certificates to trust from Debian. Debian gets its list of certificates to trust from Mozilla. Mozilla has processes to ensure that its list of trusted certificates includes only certificates from organisations that are worthy of that trust.
As Oli pointed out, the certificates you want trusted by default are already going through the process to get trusted in Mozilla. If Mozilla approves their inclusion, they will end up trusted in Ubuntu (probably within a release or two).
The process exists to ensure that rogue organisations cannot compromise the security of all users, and that legitimate organisations have adequate procedures and policies in place to make sure that their security and integrity cannot be subverted by third parties.
Ignoring this process could significantly compromise the security of Ubuntu users.
It is not appropriate to bypass this process.
If Mozilla are being unreasonably slow, then an alternative process could be developed for fast-tracking certificates into Ubuntu without compromising users' security. I suppose this might be possible if you can convince Ubuntu developers that this is a good idea. But in the absence of such an alternative process, Ubuntu users will need to wait for Mozilla's approval.