Merge Mode - Quick select

Hey everyone! 

So, for my job I have to use transparencies quite often, and I'm running into a problem where I'm getting a bit frustrated by not being able to scroll quickly through the transparency merge modes and preview what it'd look like when applied. Right now I have to press down (to open the drop-down menu), down again (to change the mode), and then enter to apply it. I've tried using Tab, Right & Left buttons, but nothing seems to make it work.

I've tried Googling this & searching the forums, but unfortunately I don't think I know the correct set of search terms to find results to my question. I've also tried to look through the customization / options for Corel, but can't seem to find anything. 

Am I missing something? Is there a setting or another keyboard shortcut / command that allows us to scroll AND preview the merge modes when working? 

It's obviously not the end of the world, but it'd make my life a lot easier and my work faster.

Any and all help would be greatly appreciated!

- Zita