Option to keep HTML tags in subtitle fields

[TB54]

Hello,

I see that the plug-in doesn't accept HTML tags, which disappear from the subtitle field when i save the page.

I suppose there is a good reason in deleting them, but they would be useful for me (and others ?), in order to choose where to broke the line of a too long subtitle (with a "display:block" span).

Is there a way to allow it as an option?
Otherwise, is there something i can change in the plugin code to allow it ?

Thanks !
Tom

(i use 3.0.0 version, with wordpress 4.4.20)