User First Name Parameter

Hi,

First of all many thanks for this great plugin!

Would it be possible to add a parameter to display the registered users first name only in emails?

Reason being for security reasons to ensure users display name is different from their username we have First Name & Last Name as display name.

The parameter {user_display_name} works perfectly, however I feel this makes the emails too formal.

Hope you can help ??

Many thanks