Hi Aj, in answer to your questions:
1) This can be done with some customization, and we do have some
existing documentation relating to this which may help.
2) You can see the publish date from within the JobRoller admin dashboard as seen here on the
admin demo site
3) Currently JobRoller is not responsive, however the changes being made to the theme which will make it responsive are planned in the next major release v1.7. The estimated release date can be found on our
theme release status page, however we are hoping to release beta next week which may see this released sooner than anticipated. Thanks.