What I have in mind is a metronome mark that would have to show a dotted eighth note tied to an eighth note = 108 so that it shows the tempo of the whole bar rather than using quarter note equals X which only gives 4/5 of the bar. Possible? Thanks.
For this, you’ll need to use Metrico and enter it as a system text object.
Metrico is an add on?
This side of Dorico really needs serious improvement! 
The application should be able deal with such tempo markings like “dotted eighth note tied to an eighth note = 108” natively, without using third party fonts, and we need a customizable metronome (similar to the one in Cubase), which is able to play compound signature times, too.
I hope the team will make this important improvements for the next major update! They are very necessary for those of us who are doing real-time
recordings.
Best wishes,
Thurisaz
Agree with Thurisaz
Agree.
I also would like to have an on board way to set any possible kind of tempo relations without the workaround with metrico (which isn’t 100% similar to bravura)
e.g.: triplet eight note equal to eight note
Pepinello: I’ve been able to fake that by typing a bold italic 3 and dragging it in place. You can also use a bracket from the lines menu and arrows from the tempo settings in engrave mode. A lot of playing around tho.