I'm still using a URC remote from 30 years ago and it still works flawlessly. I've recommended them to friends over the years and their experience is similar and they are thrilled with their remotes as well. I did a little looking and it looks like your remote should have no problem doing what you want with no problems. I think the problem lies with your installer who probably doesn't know how to or doesn't want to spend the time programming your remote properly. URC seems to be shifting more of their remotes to ones that rely on programs exclusive to dealers and installers, but as you've seen this depends greatly on the competence of your dealer. The reviews I've seen from MX780 customers with knowledgeable dealers are consistently very positive, which is more inline with my experience with URC remotes.
Since URC is now more highly invested in depending on dealers for programming their remotes I'd contact them directly and describe your problem both with your remote and your installer. I'd be very surprised if they don't have a solution for you, and I'm sure they'd also like to know about an installer who's out there making their otherwise fine products look bad.
Last couple thoughts. Looks like the model below yours -- the MX 450 -- is more in line with their legacy remotes in that you don't need a dealer or a program to make it work. Also, two of my neighbors who asked for my recommendation instead went with Harmony remotes and both failed within a year. They also seemed pretty flimsy compared to the build quality of the URC remotes I've seen and used. Personally I'd stick with Universal however you can make it work. Best of luck.
Since URC is now more highly invested in depending on dealers for programming their remotes I'd contact them directly and describe your problem both with your remote and your installer. I'd be very surprised if they don't have a solution for you, and I'm sure they'd also like to know about an installer who's out there making their otherwise fine products look bad.
Last couple thoughts. Looks like the model below yours -- the MX 450 -- is more in line with their legacy remotes in that you don't need a dealer or a program to make it work. Also, two of my neighbors who asked for my recommendation instead went with Harmony remotes and both failed within a year. They also seemed pretty flimsy compared to the build quality of the URC remotes I've seen and used. Personally I'd stick with Universal however you can make it work. Best of luck.