As for performing a TAL, it is considered a reconstructive rearfoot procedure by most hospital's priviledges. A lot of it depends on your professor's credentials and the priviedges that they got. Remember, many of the older podiatric surgeons possesses the older ABPS board certification - Foot and Ankle Surgery. These Podiatric Surgeons can perform both forefoot and rearfoot procedures, no matter how many years of residency training they received. Of course, some of these podiatric surgeons may choose to be grandfathered into the new Foot Surgery and Reconstructive Rearfoot Surgery boards if they can pass the respective exams. Most of the newer podiatric surgeons possess the newer ABPS board certification - Foot Surgery and Reconstructive Rearfoot Surgery. Up until last year, residency grads who completed two years of residency training (PSR-12/PSR-12 - back to back PSR-12 programs or RPR/PSR-12) could sit for the Rearfoot boards if they had attained enough cases to sit for the rearfoot boards. Hence, you do have some of the older PSR-12 grads being boarded in both Foot Surgery and Reconstructive Rearfoot Surgery. Therefore, you probably know of some attendings with only a PSR-12 training doing rearfoot stuff. By the way, the older PSR-24 (two year programs) programs are considered to be equivalent to the three year PSR-24+ or PM&S-36 programs. Hence, PSR-24 grads would sit for both Foot Surgery and Reconstructive Rearfoot Surgery boards. Lastly, it is possible that some hospitals may grant limited reconstructive rearfoot procedures priviledges to podiatric surgeons who are boarded in Foot Surgery only if they can demonstrate competency to their credentialling committee. It can get very complicated.
In my previous posting, I was referring the 2 yr surgical residency program to PM&S-24 and the 3 yr surgical residency program to PM&S-36 or PSR-24+. By the time the original poster applies for residency training, there will be no more two years PSR-24 programs existing.
To answer your second question, as of this year, only candidates completing a PSR-24 (two years), PSR-24+ (three or more years), and PM&S-36 program will be allowed to sit for the ABPS Reconstructive Rearfoot Surgery Board exam. This is explicitly stated in the ABPS 110 Document. Hence, no matter how many rearfoot cases that you do in the PM&S-24 program, one will not be able to sit for the Reconstructive Rearfoot Surgery Board exam.
I hope that this helps.