1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method (7.X.X?) and vicidial version with build (VERSION: 2.X-XXXx ... BUILD: #####-####).
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "manual/from scratch" you must post your operating system with version (and the .iso version from which you installed your original operating system) plus a link to the installation instructions you used. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) There is no "you can't make calls if you ignore your callbacks" function within Vicidial's core. It would have to be an external script that auto-paused the agent or perhaps changed their user group to one that has NO autodial leads in any available campaigns (thus nothing else to do but make those callbacks).
4) "Forget" is not what's really happening. They are ignoring the "you have callbacks" message on their screen which, when properly configured, will ONLY appear if they actually have callbacks they should be making right now. If they have a callbacks link on their screen, but all of them are for the future, you have configured it incorrectlly.
5) I think it would be a Worthy Feature to "auto-pause" any agent who has at least ONE overdue callback (even if it's only overdue by 1 second!). You should sponsor that.