Force Login

Hi

I would like to keep both the options open for my users for "Force Login" settings of MP Plugin. I mean I would like to give my users 2 options. Either register an account to checkout or checkout by giving his email ID and Address (not forcing a login for checkout)

Currently the Force Login settings provides either of the above 2 options. That is i can select force login yes or no. I want to have both the options for my site.

Would this be possible?

Kindly let me know
Thanks in advance for time on this.