Analysis Office 2.6 SP2 is available since two weeks. There are only some slight changes to Analysis Office 2.6 SP1. You are now able to set the selection type for the formula SAPSetFilterComponent to MEMBERSELECTORBYRANGE. So you can use it to define the filter dialog with range option as standard.
Also a new selection type for the VBA API SAPCallMemberSelector is now available. It is called MULTIPLEBYRANGE, which allows you to select a range of members for filtering. So if you found new functions, feel free to write them down in the comments.