You could check for the existance of files, and then sleep for ten seconds if none exist. That's going to be a little more processor and IO-friendly to other processes on the system than repeatedly checking for new files as many times per second as is possible.

Your script is also assuming it will never see files of the same name twice. That may be fine, but just something you should keep in mind.

Also, I think it would be a good idea for @batchfiles to be lexically scoped (as well as any other variables within the while(){...} loop). This is important because with a script that's going to be idling a long time, and iterating over and overagain, you'll have to remember to either reset all variables within the loop, or let them fall out of scope. The latter is automatic if you use lexicals.