Crew Quarter Design Efficiency
I've added a new tech line called Crew Quarters Design. Researching this tech reduces the amount of space required for crew quarters, by improving the efficiency of the design, so the crew can spend months travelling in relatively small space without feeling cramped. After spending 11 of the last 14 months travelling with my wife in a 25' motorhome, this is a technology I can relate to 
The levels are similar to fuel efficiency tech and start at 90% for 1000 RP, down to 25% for 120,000 RP. This is a Logistics technology.
Rather curious change, how will the numbers compare to the current system? Will the current baseline be set as 100% efficiency? Because utilizing a quarter of that volume at high tech seems rather low.
I definitely recall seeing suggestions for denser crew quarters on this forum, but I'm rather surprised you chose to approach it this way. If simply setting a lower deployment time is deemed insufficient, research options could provide a way to reduce crew quarter space at the expense of maximum morale or reaction speed, simply dumping RP to dispel your crews' notion of personal space feels rather weird 
Yes, the current baseline will be 100%. The change is intended to allow longer deployment times without prohibitive space requirements. It won't make a lot of difference for ships with low deployment times, as their crew requirements are a much smaller percentage of total hull space anyway.
More efficient use of space is a real concept, not simply a way to 'dump RP to reduce personal space'. Last year two of us lived in about a 20'x7' space for nine months. That space includes a king-sized bed, a shower, a cubicle with toilet and sink, an oven, a three-ring hob, kitchen sink, fridge-freezer, two small couches, a dining table, two seats (driver/passenger), several overhead compartments, plus other storage. It also has 12v and 240v electric systems, plumbing for the two sinks and shower, gas for the over/hob and fridge, central heating, etc.
Yet it always seems like we have plenty of space. That is great design within a limited space - especially as we have been used to living in houses with 5+ bedrooms and multiple, large reception rooms. In fact, we have changed our perspective so much as a result of our time travelling, we are looking for a smaller house, as the previous ones now seem to have a lot of wasted space.
So to the original point, this is a game mechanics change to allow longer duration deployments, particularly for larger ships where the required crew space can be hard to justify vs other systems. Given my own recent experience with how good design can change your perception of space, it seemed like a reasonable way to implement it.
Just for interest, here is the motorhome (and yes, its French

).
https://www.rapido-motorhome.co.uk/motorhome_a-class_serie-80df_8096df.chtml