core/play-guice/src/main/java/play/inject/guice/GuiceBuilder.java
public final Self configure(String key, Object value) {
    return configure(ImmutableMap.of(key, value));
  }
public final Self configure(String key, Object value) {
    return configure(ImmutableMap.of(key, value));
  }
Add additional configuration.

@param key a configuration key to set
@param value the associated value for <code>key</code>
@return a copy of this builder configured with the key=value