Custom maps? Nah.
For saber only you'll want the following maps:
NEVER use map raven EVER! hate that map, no good for saber duels and it's so very crampted.
With promod as is, there are fewer people in the servers (mostly because of people not understanding it and not having auto-dl on) and custom maps will get you even less players.
Edit:narshada and ctf_bespin=NO!