Hi Emre Ozan Alkan,
Please download the latest internal build (2009.2.9.903) from your Telerik account about the second issue. We modified substantially the code about menu merge. Thank you very much for your time.
About your first question, please see this help topic
. We followed this specification
when implementing Menu Merge. Items can replace other items only if they share the same position (name is not relevant).
the Telerik team