Support

It would be nice that the user could see the credits consumption in the ticket list view.

We actually have a module (Akeeba Ticket System - Credits info) to display available credits and/or information on time spent on the user's tickets by the support staff. Modules are very flexible, you can put them in any convenient place allowed by your template. By using a module instead of hardcoded display we do away with the need for yet another confusing configuration option and/or the need to do a template override to move this information around.

Please remember that the credit information is always displayed in the New Ticket page, along with a warning if the user does not have adequate credits to file a ticket. We've found that this is the single most important place where users need this information.

Can the list be sorted by last updated?

Unfortunately no. I toyed with the idea a bit but it was becoming a maintenance nightmare because of the way Joomla! pagination is rendered (we have no control on the HTML being output). This would require us to put a drop-down either at the top of the page (which is already cramped if you use a narrow content are template e.g. Beez 3 with both module sidebars displayed) or apparently thrown recklessly at the bottom of the page. So I had to choose between filtering by category and letting you sort by ticket ID or last reply. I chose the one people were actually asking for. If I find a way to present more filters in a way that makes sense I'll update the page.