How to show a dropdown field in add form, and returns an integer to my BCS WCF webservice.

I have a sharepoint 2010 portal. I have created an external list which is connected to a BCS/ECT. The BCS/ECT is connected to my WCF webservice. See below my create webmethod:

Public void CreateIncident(int indidentId, int statusId, DateTime date)
{
     // some logica
}

I need to receive in my webmethod an integer for the parameter statusId. But I would like to show an dropdown to my endusers with some status values like (new, in progress, closed, waiting on customer ). But when the enduser select one of these dropdown items, I would like to receive an integer in my webmethod.

Can someone tell me if this is possible?

Someone told me to create my own add and edit form in InfoPath, is this some good solution?