[Plugin: WPtouch iPhone Theme] thumbnail selection

Like others I am using a theme with an extra field called “thumb”
Would it possible to have wptouch have an option so admins could select what their thumbnail field was called?

For example

Select Thumbnail Field: would have a dropdown box with some common and obvious field names like “thumb” “thumbnail” “tb” etc?

https://www.ads-software.com/extend/plugins/wptouch/