I'm a customer, like you. I'm not saying you "should" fix it, I'm saying that if it's important to you to get a fix as soon as possible, then you "can" fix it yourself, if you want to. I suppose you can think of it as rude that there is a cosmetic bug in the product, but I think it's great that in SlickEdit it is possible to fix stuff like this on your own, if you need a fix sooner than the company is able to provide one. There aren't many products where you can fix them yourself if you really need to. It is good for mouse cursors to look right, but it's not the kind of thing I would get very excited about.
Perhaps the best thing for you to do, is to write an email to support@slickedit.com and tell them which controls, on which forms, have the wrong cursors. The more specific and detailed you can be, the more likely they can find them quickly and fix them.