Toast questions

It is supposed to be the best burning package on mac.
But I doubt it.

I convert videos to dvd-video format using the absolutely brilliant windows7 application convertxtodvd. Please dont tell me to use a mac application instead of it. I tried it many times, there were always several problems(slow speed, subs etc). This is not the case here.
So, I want these dvd-videos in Video_ts format, to be burned in dvd disks using toast.
It is supposed that video_ts folder are a standard folder, no matter the system you use.
But toast has a different opinion. When I drag the folder in the dvd-video window, it asks to re-encode the video!!!
If I try to burn this video_ts folder in windows machine using 'nero', no problem at all, straight burning!
I really cannot understand why this happens.
Can you please help me on this?

Another problem I have is that the files I want toast to burn, usually reside to network computer.
Is there any way to burn files from a network computer(win) using toast? Can toast access network or not? If not, I have to manually copy files to local disk, several minutes spent for copying gigabytes just to be able to burn them.
So, is there a solution for this?