Hey, thanks for the shoutout! I'm a longtime lurker of this forum and I'm glad that you've found QuickFS to be useful.
With regards to foreign (non-U.S.) exchanges, we're constantly experimenting with adding new ones. For instance, you can find many Australian Stock Exchange stocks on our website, even though we don't officially support ASX stocks. We do officially support Canadian stocks, so please let me know if we're missing any. Otherwise, we're open to suggestions for which exchange(s) to include in our coverage next.