There should be a way in the UI to set the width of the Ticket Details and Additional Details blocks. Right now they're way too narrow, and look bad with as many word wraps as they have. The ticket I'm looking at currently, out of 7 items listed in Ticket Details, 4 of them are wrapped. It's very hard to read.
This can be set with CSS changes, don't think this should be a UI option. I have added the ability to do a custom css now. Just add helpdesk_custom.css to your theme css directory and make your changes there. Install/Uninstalling SimpleDesk will not remove this file.
shd_ticket_side_column {
float: left;
width: 255px;
margin-right: 20px;
}