Towerdog,
Yup, locked on type for 3 years. And fair enough too, if you ask me. What is 3 years in a 30+ year career. You´d still have time enough for 10 different types (almost)

Much more than I´d care to learn....

No seriously, with the cost involved in typerating these days in mind, I see nothing wrong with a 3 year freeze. Do most pilots at your outfit change type more than once every 3 years??
Concerning SAS Commuter; yes, deal is that those hired at SC gets their number on the combined SAS/SC seniority list when hired. They also start earning "pay seniority" from the first day at SC, so that when/if they choose to move to SAS, they´ll start on payscale level 4. (They´re stuck for 4 years at SC).
Rgds, Hung start