I just tried Spark and understand now what problem you solve.
Spark flow - discovery available services and show icons at the top of roster, I can click icon, register and check do I want to login automatically or not. Yes, spark with gojara works perfectly 
Kraken flow - if I register from Spark, it does not add transport jid to roster and does not persist all transport contacts in roster and Spark flow works as usual. but if I register from another client - it add transport jid, add all contacts and works as other clients are want.
So, what I want from Gojara - the same flow as Kraken 
Is it possible?