Yes, angelanna. You can merge or split your video file via FCP sequence.
ahaah, maybe I think angelanna would like to get the resulting file with MTS format because he mentioned “No need to be compressed”. Are you asking for this, angelanna?
If so, a simple MTS files managing and editing tool is needed. Maybe you can have a try the Mac version of Aunsoft Final Mate for managing HD camcorder footages. I just downloaded its free trial version and it offers a simple way of garping footages directly from camcorder. And also it provides a attractive feature to join flawlessly and split accurately native MTS files for video file output with original MTS format.
Maybe this is the tool cwhich an help you out, angelanna.
Enjoy your video.