Hiring students

We have to go through the campus ESH program and post all positions on the campus employment website. This is a total pain because:
a) Not all students come packaged with ESH, so some excellent students aren’t eligible
b) ALL the students can see your listing…and don’t necessarily READ the text. So most of the applicants so far aren’t eligible (you can’t TA for a class you haven’t passed, and you can’t work in the stockroom when you’ve never taken a class in our department!)

I haven’t figured out how exactly to *do* the hires. Should I interview students myself? Have the stockroom manager interview the stockroom assistant applicants? Ask colleagues who know the students and/or are teaching the class for recommendations? Should I do “rolling” hiring, or wait until I have a selection to choose from?

I guess the answers to these questions depend on your institution. I’m at a small place—less than a thousand students, and six faculty members in my department. So my plan is:
--pre-screen applicants and decline unqualified candidates
--do informal interviews with the students who are interested, mostly to find out their schedules
--for lab assistants, ask the person who would be working directly with them if that applicant would be acceptable
--for stockroom assistants, have the students meet with the manager, and let him make the final call.

Any suggestions? Things I’m missing?