No, I don't. The repairmen here have been coming to this house for a couple of decades, though we've only lived here for the last three years, and they have a good reputation in this small town. We also don't really have anything of value worth stealing, so no point hanging over the poor guy. I hate having people breathing down my neck when I try to work, so I extend the same courtesy I'd want for myself. Our house is small enough that we're usually nearby anyway, but certainly don't go out of our way to keep an eye on the repair person unless it's to make sure my dog leaves him alone. It probably depends on the individual of whether they like that or not, but I'd guess that most don't -- they're trying to focus on a job, and my presence can offer no benefit at best or be a distraction at worst.