I dont think you can give negative trust to yourself.
Shorena's rating on me is fake and a result of him working with you for many years prior to any of this. Going through all his ratings (many of which are effectively useless) has given me more information about the history. 
I can set the "Trust depth" to 1
Am I correct?
Yes.Am I correct?
Also, I saw someone with "Satoshi" in his trust list, what's the use to include some who will never come back and has never left any feedback o.0
Many people in DT still have no idea what they are doing.