Gliclazides can, in theory, induce hypoglycaemia, never actually seen it happen, but our latest guidelines have a caveat in about drivers.
The main stay of diabetes control, was traditionally to try and reduce HBA1c. It's an area of rapidly changing parameters. It's likely that sorting lipids and blood pressure control out is likely more important in the long run
Probably not apt to you young pilot chappie's, but one episode of hypoglycaemia doubles your risk of early cardiovascular disease by a factor of 2.
Sorry, can't specifically answer questions about type 1, it's a fast changing field, so don't give up hope.