Mine does 15 out of the box if you are scanning the same trunk system and olny trunking...see below from the help files
if youwant to do multi trunk systems or conv & trunk you will need the hack..It takes 2 min if you have used hex edit before and maybe 20 if you have not
Scan Type (Scan List, General)
Conventional: Only
Conventional dispatch channels may be selected.
Note:
Fifteen Scan List Members are possible.
Priority Monitor: Only
Trunking dispatch channels may be selected. A Trunking System must be selected for the current Scan List from the
Record Number field.
Note:
Fifteen Scan List Members are possible.
Talkgroup: Both Conventional and Trunking Scan List member channels can be selected.
Note:
Ten Scan List Members are possible.