File name length is limited by Commodore DOS, 14 characters iirc.
16 characters.
Yes, JiffyDOS in the host C= computer will speed up loads/saves greatly on the uIEC (or SD2IEC), whether that computer is the VIC-20, C64, C128, or Plus4.
Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcugThe Other Group of Amigoids
http://www.calweb.com/~rabel1/Southern California Commodore & Amiga Network
http://www.sccaners.org