[Plugin: Fast and Secure Contact Form] subject line

is it possible to have the return email to us sublject line read from a custom field.

We have a custom drop down field of venues that people can select from.

we woild love the venue to appear as the subject line in the email back to us.

is this possible, and if so how ?

many thanks
richard

https://www.ads-software.com/extend/plugins/si-contact-form/