I run a network using a Mikrotik rb750 and v.5.4 I have been a few problems.I have administrators(customers) who register users and recharge their accounts. I implement an up-time based limitations. I would however like to make a few improvements:
1. make the registration of a user be able to hide the password. This is a problem because the passwords can be stolen and the accounts of the users compromised
2. enable users check their credit up-time left when logged on to either pppoe or hotspot
3. print out vouchers for users to use. Just in case a solution or using administrators has to be scraped at the compromise of security.
Thanks in advance.
Keter.

As far as being able to hide the password on the sign-up page, do like we do create your own login page. Place it on the router and update the links. Not really that hard as the login page is mostly html with a form posting varibles back to the router. After re-reading are you referring to the customer view of users in the userman interface?

Users can check the uptime left by login to the Usermanager system with their username and password by going to http://x.x.x.x/user or http://x.x.x.x/user/customer. For more information I suggest looking at the wiki: http://wiki.mikrotik.com/wiki/User_Manager . You'll have to read between the lines as it's not up-to-date for v.5.5 yet. This also allows users to recharge the account themselves without Customer interaction if you have paypal or authorize.net setup and enabled.

x.x.x.x = router's ip address where userman is running
user = "user" denotes if user pages or "userman" denotes administrator (Customer) pages.
customer = prefix of customer using the router.

Really study the wiki cause it defines what a user, customer, and router is. They are not in the terms usually thought of. What wisp usually call a customer is a user, a wisp is the customer, etc.

hope this helps.