TC does support encryption of GTP drives. It does not, however, support booting from them.
The main (and almost only) advantage of GTP is the ability to contain partitions over 2TB. If your notebook HDD is not over 2TB in size, you can go back to MBR without real disadvantage. If the HDD is over 2TB, I still suggest, you don't use the whole drive as one partition. Splitting the system and data is generally a good idea. This way you'll have much less trouble in case something happens to the system. And this enables you to use MBR format until GTP booting is supported.
Tip for desktop PCs: most of the motherboards have got a RAID controller built-in. Some can be configured to split the HDD into multiple virtual drives. So you can create a drive for the system to boot from and a drive for the data. This way you can use MBR for system and GTP for the rest of your HDD as the OSes will see two drives.