I'm terribly sorry for missing your question yesterday, and thank you, Guppycur for answering in my absence.
Adding complimentary mods are done as-requested, usually by either the players, or from the modders. Typically, if I see a combination that can be done safely, without adversely affecting the base mod, I'll make an entry for it. Such things would be adding CompoPack as an option, or a UI, if no UI is in the base mod.
For larger, more complicated builds, I usually avoid that and leave it to the modders themselves. These mods are so big, they cannot be easily merged with any other mod, and must instead be supported in the base mod.
For Starvation specifically, they have resisted the call for a larger backpack, as they feel it goes against what their mod represents. That will always be respected. They have mentioned they may look into it in the future, but nothing concrete. Similarly, the UI is very custom for Starvation and is incompatible with any other UI. If you plop SMX in there, then the custom workstations will stop working, and other odd things will happen.