If there are two types of subtasks: "Sub-task" and "Sub-task (BUG)", when creating a new ticket, the "Sub-task (bug)" is set as default. It would be useful to have the ability to set the default subtask issue type.

When you are about to create a subtask and you happen to change the issue type, that issue type is saved by JIRA (even if you don't actually create a subtask). So when you try to create a new subtask, what you had previously selected as the issue type will show now up as the default.