There isn't any feature or functionality that allows for presetting any of the options. Some users have pretty much the exact same selections in specific drop-downs and they have to waste time with every ticket selecting those same options over and over. Being able to preset some of those options would be a big time saver.
When creating a new task, the Due Date is defaulted to 1 week in the future. Why? That makes no sense. If the task is being resolved the same day (or right then), the user has to either click the NONE link or open the Due Date and select TODAY from the calendar. You should be allowed to customize the Due Date to TODAY or NONE without having to click anything. Another option would be to MOVE the TODAY link from off the calendar view and put it next to the NONE link (i.e. None, Today). That would allow the user to set the due date with a single click. I submitted this to Intervals in January 2015 as a feature request and nothing ever came of it.
I haven't found any ability to make the different options not be required when creating a task. Depending on the client selected, I shouldn't be required to select 6 or more other options. There I go back to the being able to preset options.
When you click the Documents tab, it starts building a list before you even select any of the filters. That makes no sense. But I have to wait for it to finish building the list before I can change any of the filters. Waste of my time, especially when I need something right then. You should load the page blank and allow the user to search for all (as it currently does) or to adjust the filters. Just for fun I clicked the tab and it took 3+ minutes to load 14,253 documents, and with the records per page defaulted to 10, that's 1453 pages.
Documents added to tasks are another pain. You get a task and check and there are 15 documents attached. When you check the attachments, it's all the social media icons and crap in their email's signature. And their personal photos and cartoons and just crap that I've got to waste time deleting. And the more times the email has been replied to and forwarded to other users before it gets sent to Intervals, the more of that crap there is. YES, absolutely, there are times when the user will send an email with a valid image embedded in the body of the email and that should be added to the task as an attached document. But not every single social media icon in the email signature.