It is not a beta problem but general remarks prompted by my testing 253B2 FTP with z/OS.
1. I would suggest adding Sort (a/d) to server list in addition to move up/down.
2. I would add default (ASCII or binary) transfer mode definition to the Server/bookmark configuration, still allowing change of it via right click on the file list panel. Every time I connect to z/OS or z/VM I have to change the transfer mode to ASCII.
3. I am not happy with the fact that transfer mode selection unselects previously selected files.
Otherwise, since I encountered Salamander, can not see life without it.