Can someone help me understand Request Templates and Context Fields

[Alyse Middleton]

When i am creating a Request Type Template Jira offers a set - but seemingly random set of the available custom fields.  

When i add new fields it adds some of them to context fields in already created Request Templates.  Which i have to then go into every Template and remove (PITA).

Is there any way to have better control over this?

[Alyse Middleton]

This is the set of fields I would want as "context" on all tickets. Unless one or more is included in the request fields.

This is a selection of recently created fields that it helpfully added to the context section of EVERY request template/type already in existence.