I got this info from here:
http://www.cra-arc.gc.ca/E/pub/tg/5000-g/5...html#P319_25148I think it answers some of your questions. I would recommend calling the Internation Tax Center rather than the regular line.
Which tax package should you use?
Generally, you have to use the package for the province or territory where you resided on December 31, 2007. However, there are exceptions (see next section) such as if you had residential ties (see the definition below) in another place. You should have received the package you need based on our records.
If you resided in Quebec on December 31, 2007, use the package for residents of Quebec to calculate your federal tax only. You will also need to file a Quebec provincial return.
Residential ties - These ties include where your home and personal property are, and where your spouse or common-law partner or dependants reside. Other ties that may be relevant include social ties, a driver's licence, bank accounts or credit cards, and provincial or territorial hospitalization insurance. For more details, see Interpretation Bulletin IT-221, Determination of an Individual's Residence Status.
Exceptions
In the following situations, you should use the package indicated:
A. If, on December 31, 2007, you had residential ties in more than one province or territory, use the package for the province or territory where you have your most important residential ties. For example, if you usually reside in Ontario, but you were going to school in Alberta or staying in a ski chalet in Quebec, you would use the package for Ontario.
B. If you are filing a return for a person who died in 2007, use the package for the province or territory where that person resided at the time of death.
C. If you emigrated from Canada in 2007, use the package for the province or territory in which you resided on the date you left. Mail your tax return to the International Tax Services Office, 2204 Walkley Road, Ottawa ON K1A 1A8.
D. If you lived outside Canada on December 31, 2007, but maintained significant residential ties with Canada, you may be considered a factual resident of Canada. Use the package for the province or territory where you kept your residential ties. You also have to complete Form T1248, Information about your residency status, and attach it to your return. Mail your tax return to:
International Tax Services Office
2204 Walkley Road
Ottawa ON K1A 1A8
If, under a tax treaty, you are considered to be a resident of another country, this may not apply. For more information, contact us.
E. Generally, if you did not maintain significant residential ties with Canada, and on December 31, 2007, you lived outside Canada and were a government employee, a member of the Canadian Forces or their overseas school staff, or working under a Canadian International Development Agency program, you may be considered a deemed resident of Canada. Use the package for non-residents and deemed residents of Canada. This also may apply to your dependent children and other family members.
F. If you stayed in Canada for 183 days or more in 2007, you did not establish significant residential ties (see previous section) with Canada, and, under a tax treaty, you were not considered a resident of another country, you will be considered a deemed resident of Canada. Use the package for non-residents and deemed residents of Canada.
G. If, throughout 2007, you did not have significant residential ties with Canada and neither E nor F applies, you may be considered a non-resident of Canada for tax purposes. Use the package for non-residents and deemed residents of Canada.
However, if you earned income from employment in a province or territory, or earned income from a business with a permanent establishment in a province or territory, use the package for that province or territory. Also, complete Form T1248, Information about your residency status, and attach it to your return.