First of all, you're like a Head of Personnel, with roughly the same access – you do basically the same job, except that you only have to deal with Interns, Assistants, and non-corporate personnel. Also, your job allows you to be less required than a Head of Personnel.
Before you start going around with your newly created Emergency-ID (Read:All-Access ID), you should alert the other Heads of your presence, and make sure that the civilians know that you're active and ready to give them a real job! After having assigned the civilians to every department they've chosen (note that new players and characters may best be assigned as Interns or Assistants), you can go to the Bar and have a drink! Or better yet, you can give the Head of Personnel a break and take over day-to-day business for him if he doesn't object. (You're basically their CorpComm counterpart, so you should help them).
You basically move the newly arrived visitors into every Department and when a department is lacking in crew members, you are expected to take the initiative to hire more civilians for that department! Offering pay raises, reimbursements, or recommending people into certain departments are all good ways of convincing people to move to a department that needs more staff members. Denying (or “strongly discouraging”) civilians a transfer into a fully-staffed department is a good way of getting crew into the places you actually need them as well.
If someone's job request isn't completely ridiculous, then it's time for you to do some background checks. (Basically, this is both for RP reasons and security reasons; you don't want a troublesome civilian inside the Toxins Storage, do you?). Make sure the crew member knows what they're going to be doing inside of their new department before assigning them there. Note that making them an Assistant to that department is an option.
Once you've decided that someone is a viable candidate for that job, it's a good idea to grab one of the several versions of the job transfer forms. Pick out one that you like and give the form to recruit; ask him to fill it out. (Yes, even if it's boring…) Keeping a record of all of the Civilians you've recruited is key to keeping every Head informed about what you've done and keeping you out of trouble.
Finally, when everything is signed, stamped, and filled out, you can sign the form yourself. Ask the crew member for their Identification Card so that you can officially give them the requested job title and access. Unless someone would like a specific job title, make sure to use the generic job titles near the top of the screen so that Security can identify that person much more easily with their fancy SecHUDs.
Let's be honest, the first time you've seen the ID Console, you've wanted to create a All-Access ID for yourself! This isn't totally a bad thing to do, but you absolutely must keep it in a safe, easily accessible and personal place, unless you want the crazy one running around with a Captain-Level ID with your name on it!
As the HoP usually gives himself All-Access everywhere, you're expected, being part of CorpComm, to have a more serious approach about this practice. But we both know that you're going to do it anyway, so why bother?
Keeping such a powerful thing in a safe place will probably help you if you're in a troublesome situation (Like being closed in a hallway by two firelocks and something nasty is incoming), but apart from that, there's no real need of creating one. Also, if a antagonist knows that you have such a thing, he'll surely add a cross on your photo.
As an example, you could play as a subservient right hand man to NovusCorp, or a devious power hungry maniac, only serving to further your own career goals (the stereotypical corporate tool). Remember, whatever you choose, try to enjoy it, and try not to ruin the round for other people.
Same as the HoP: You may have access to it, but you are not (read NOT) part of the Security Staff. Also, you don't have any security gear, so don't even try to help them, you're just a High Ranking Officer from CorpComm skilled with paperwork and other theoretical things!
While you are loyalty implanted, you can still be a Vampire, Changeling or Blob, and your All-Access ID will be very useful for finding your objective, a safe spot or a good place to hide in and await your transformation. Mix this with your capability of being rarer than water in the desert (thus leaving you usually ignored by the rest of the crew), and you'll make a deadly traitor above every suspicion and capable of going everywhere!