Ok, here's a beta release of the next version...
The admin screen can be found in Tools -> Transients. From here you can perform ad-hoc runs.
All functionality has been added - it's just a case of testing it now.
To save you digging through the README here are the changes...
Maintenance: Split files because of additional code size
Maintenance: Removed run upon activation
Enhancement: Improved transient cleaning code efficiency
Enhancement: Added administration screen (Tools->Transients) to allow ad-hoc runs and specify run options
Enhancement: Added internationalisation
One thing to specifically check is the datestamp in the option screen - by default PHP returns the server time which didn't necessarily correspond to the WP user's time. I've therefore timestamped it with, what I believe is, the local time.
Let me know if you come across any issues. I'll be testing it over the next few days.