option to preserve sequence header (id) on save?

When jalview saves into any format, it has the option to add sequence ranges to the ID. Unclicking this option has the desired effect of not saving said sequence ranges but has the undesired option of DELETING any such ranges that were already there. If one has a mix of formats in ids (or some IDs are in that format even if they aren't seq ranges), that means IDs are changed between saves, which is a royal PITA for downstream processing.

Example problematic file:
>first/501-512
I---HASSANDWICH
>second
ICANHASSANDWICH

I propose an additional option ("Preserve input IDs") that does not alter the IDs no matter what. I'm guessing that this would require the addition of a variable to store said input IDs and would therefore be slightly more work than it appears, but it would be super-duper helpful.

Thanks!