Let me start with making a point that I expected to be implicitly understood, but which for some reason never seems to come up in this type of discussions here on SDN.
Pharmacies do not exist in the vacuum, nor do they exist to educate students. Like any other business, pharmacies hire according to business need. Most of the time, you are fully staffed according to your need (or according to what district management thinks you can have). Therefore, the only time a pharmacy would be hiring, would be when a) tech hours expanded/new shift created (in this economy - pretty much not happening), or b) one of the current employees leaves and needs to be replaced.
Accordingly, you may be the best employee in the whole wide world, but if I don't need you, I don't need you. And if I need you, I need you for specific shift(s), and if you can't work them, then again I am not going to wreck the schedules of everyone else to accomodate you, unless it's been a few weeks and I still haven't found anyone to work those specific hours.
Getting to your specific questions.
As a student, I worked at a Walgreen's which had only three full-time techs, and about ten students (a couple of them pre-pharm, but mostly pharmacy interns - interns are much better because they can take voicemail, do basic counseling, etc.) And accordingly, the full-time techs worked day shifts, while two 5-hour shifts every night and all the weekends were covered by students. Other stores in the area had maybe one or two pharmacy students and were otherwise staffed with some 5 full-time techs. That's why I suggested a store which already has a lot of students working there, shifts are built to accomodate that, and they need to be replaced yearly. So definitely it is very possible to be hired as a student - just look around at which places may need a student, don't try to convince a store that needs a tech 9-5 M-F that you with your 6-10pm availability is the best thing ever - not going to work.
As a CVS assistant manager you should have some experience in the pharmacy, right? A lot of Walgreen's assistant managers are certified techs (even though they spend too little time in the pharmacy to be proficient, at least they know basics of what they are doing and more importantly, what not to do - can't underestimate that!). So I think it is a good thing to list on your resume, and be prepared to talk it up. Good luck! 🙂