Now this is more an educated guess than fact but It should get the ball rolling for you.
1- The movement would come in a non serviced state so would more than probably be dry,If you are putting this movement into a keeper watch then get this serviced.
2 - Probably not but see point one.
3 - If the movement runs at the same BPM as the swiss then it will have the same sweep motion.
4 - Non mod version should be way more reliable as it is a standard configuration.