I didn't have time to leave the system I was in in time to be back for the soonest assassination mission I had so I mostly did mapping missions and picked up new missions which would fit nicely with all the ones I had ready. With the multiple cargo missions I picked up, I got their cargo and I'm ~18 hrs away from the assassination and have ~290 t of cargo (no fuel in it).
As you can imagine, this is making maneuvering sluggish and acceleration slow. I wish I could have left the cargo at the assassination spaceport paying a small fee to store it, eg 1 credit / 50 t / day.
Thank you for considering implementing my wish