Complete "rewinding to start" may be reached by detaching and again attaching the .TAP-File. But something like ".rewind" may be helpful? (Even if the desired "Tape-Blocks" can be named "1", "2" and so on, so we just can do an "LOAD "2"" to load the correct one).

Or maybe a way to "Auto-Rewind" to start of .TAP-File if the of .TAP-file end is reached? ... Haven't tried this yet, maybe this feature is already present in esxDOS.