Which file has cron throttle settings form?

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/admin/settings/simplenews/mail

Cron Throttle setting
Sets the numbers of newsletters sent per cron run.

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The options allow 20-50-100 emails per cron run; naturally my web host allows 40 emails per batch.

I don't like hacking any one's code; but if you could tell me which file the form is generated in, it would seem a simple thing to add that one more number to the selection list. I think I could do it without destroying my site.

I regret that I do not understand PHP code well enough to offer you help on maintaining SimpleNews. It is a very necessary and well-used module.

Ashford