[exim] av_scanner doesn't accept options like pri=, weight=

Hi!
I noticed that I can't use additional options (available for
spamd_address) in av_scanner. Especially I'm missing "pri=<priority> "
modifier.

I'd like to bring attention to mail:
https://lists.exim.org/lurker/message/20160819.071333.37230507.en.html
It would be nice to here "yes" in answer but if it's not possible it
would be enough to hear any answer;)

Thank you,
Marcin