Use authfile instead of salt password prompt to make TX

In order to make batch TX, could it be possible to add --authfile ./source_autfile instead of prompting for salt/password?

silkaj -p g1.le-sou.org:443 tx --amount 10 --auth-file ./g1sms.priv.key --output DsEx1pS33vzYZg4MroyBV9hCw98j1gtHEhwiZ5tK7ech
Usage: silkaj tx [OPTIONS]
Try "silkaj tx --help" for help.

Error: no such option: --auth-file
silkaj -p g1.le-sou.org:443 tx --amount 10 --output DsEx1pS33vzYZg4MroyBV9hCw98j1gtHEhwiZ5tK7ech
Please enter your Scrypt Salt (Secret identifier):
Edited by Fred
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