Since the Counter pre-processor isn't capable of dealing with large values, it would be nice if the Counter could add leading zeros to its value. Ie, if I want to generate counter values 70,000 through 70,100, I could create a counter for 1 through 100 and indicate that I want three leading zero's. The I could just have "7${CTR_VALUE_WITH_LEADING_ZEROES}" in my script.
Changed to long rather than int; will be in next release (or next nightly)
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/1590