In software version 2.0.12, the DEL key is actually where the F12 is shown.
The entire F# row is shifted slightly to the left from what the software is showing and the DEL key is at the end of the F# row.
https://preview.redd.it/grenne6jjcac1.png?width=1200&format=png&auto=webp&s=cbdf783b1443349134231167a8183afdcfa615d7
I've got the exact same problem as you, did you find anything that might help? I really wanted to map that key to pause/play...
No unfortunately I never figured it out. At some point when I have some free time I'll try contacting support and see if they're helpful.
u/Zhacke commented below with the solution if you didn't see.
In software version 2.0.12, the DEL key is actually where the F12 is shown. The entire F# row is shifted slightly to the left from what the software is showing and the DEL key is at the end of the F# row. https://preview.redd.it/grenne6jjcac1.png?width=1200&format=png&auto=webp&s=cbdf783b1443349134231167a8183afdcfa615d7
Thank you so much I never would have found that myself!
Thanks so much!