Hello,
Yes there is, we are currently working on a rather large update which is why it has taken so long.
1) Did you setup the File storage plugin correctly in osTicket? as our plugin can only work if it can read the actual file, it does not handle the file Database storage which is osTicket's default.
2) that is most likely done by your browser which has remembered certain fields and auto-fills it.
3) The plugin more or less does this on purpouse to remove any clutter it might have if you no longer want the plugin. in the future we might be able to run the removal of settings on uninstall but there's no such feature planned on upcoming release.
4) hmm in general it takes over the theme's settings on buttons etc besides the create button, best to overwrite that with !important in your theme's css. i generally recommend to use the "inspect" in chrome/ ff/ opera to find the right css values to adjust. (it shouldn't be that many)
Regards,
Marco