Missig possibility of having fodders with more slots

[EverybodySomebodyNobody]

Is your feature request related to a problem? Please describe.
Allow to add slots to fodders.
NGS should be coming soon, so no idea if it worth the effort...

Describe the solution you'd like
An "Add slot" button to fodders when affixing

Describe alternatives you've considered
"Junk" Transplant, allowing the use of Junk to transplant as a pseudo-upslotting so can reach the desired slot

Additional context
So, I was preparing my unit affix and noticed that cannot have more slots on the fodders (https://bit.ly/3sDpplp).
It would be interesting, since my affix plan is using the intermediate affix until I have the rest of the needed affixes

This ends up having the one extra slot on my affix plan for the rest of the fodders than it should