Content Restriction without Paypal possible?

NOTE: I’ve read quite a few “No Paypal” threads but none of them really provided me with an answer to this scenario.

I’m new to s2member and I’m using the wordpress theme OptimizePress to produce an online training website.

To kill 2 birds with the 1 stone, I want to upload training content for the following user types:

customers
reseller partners
premium reseller partners
internal staff

So I thought it would be logical to set these as the membership levels as I don’t want customers to see the same content as the reseller & premium reseller partners or the staff, I also don’t want the customers, reseller & premium reseller partners to see specific content for our staff.

We don’t want to charge for any of this access. So in effect they will all be free members.
But how do I allow them to register without using Paypal?
NB: I will manually register staff level membership users.

What I’m looking for is input on the best way to allow for each type of member to register on their own.
(i.e. So I can avoid having to manual sign all members up – probably over 1000 users)

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Finally if this is not possible. I would like to allow 1 registration that just sign’s up customers and I will have to manually add all of our resellers into the system manually.

UPDATE:
I just watched this video which seems to point towards the answer I’m looking for.
http://www.s2member.com/videos/A2C07377CF60025E/
However I can’t use the paypal button generator as I’m not charging for any of my membership levels/custom capabilities.

^^^ Potential Pro Customer
I’ve posted in here and Pre-Sale questions forum. Still no response.
Will need to look at WooTheme’s shortly as I have to get started on this project asap.