I had an idea for that at one point.
The funny thing is that there is a Bar / Cantina room that they used for 1 cutscene. Generally i think you would have a few different things to do in it which would still fit in 40k.
-The Bar man can sell rations that give small temp buffs. This wouldn’t be anything game breaking but maybe slightly faster stam regen, bit more max health for a mission, reduced toughness damage, etc
-Mesozi’s Gambit which is an idea i had in another thread which would go in the bar. Mesozi gives you a hard mission with a unique modifier (no hud, lose ammo over time, etc) and you put up a bet of credits and / or crafting mats. If you beat it you double your bet and get a bonus item
-The Chem dealer, a similar idea to the bar man but rather than giving a temp buff you can purchase a stim that takes up a equipment slot. The stim can be used and give boosts similar to VT2’s potions. Ideally this would be used in tandem with Mesozi’s gambit to get through hard parts of it and give a credit or diamantine sink.