One of the most difficult aspects of setting up WHMCS is the domain configuration.
With the advent of gTLDs, selling domain has gone from 50 to 450+.
Doing this manually is bad is every form.
With the level of integration that ENOM and OpenSRS currently have with WHMCS, there is no reason why this be this dreadful manual work.
It will be most helpful to be able to configure the pricing on either ENOM or OpenSRS side (their window and automatic price configuration make this easier than what WHMCS provides) and import this automatically to a new WHMCS setup by just filling in the username and API key.
Please do consider making this side of WHMCS easier.