A bunch of things have been done to help single clubs with capturing opposition information on scorecards:
Bowling figures are now shown if the figures have been entered but the bowler is kept blank
Blank batters, fielders and bowlers will now all display consistently on match reports as '-' by default
You can configure how blank players are shown on match reports in Setup/Stats Site Config
You no longer need to enter batter names and scores to retain the bowler/fielder info on the batting card
Importing matches: bowling figures will now be imported if the bowler name match is skipped/kept blank
Q16 in the FAQ has been updated with info on the minimum required for single club scorecards
Generic (opposition) player records can be tagged as "Global" so that they are available as a player selection option for every club in your league (requires L7+ access) - although, you won't need this if you leave opposition player names blank
Player merging can now be done where the destination player ID is 0/blank (be careful with this)
[update] You can now set your stats site to only show stats for your club
[update] You can now set your stats site to hide links for opposition players when operating for a single club
An example match where @Joel Ridley has configured blank players to show as "Unknown Player": https://www2.cricketstatz.com/ss/w?club=27772&mode=100&match=3006278