How to bring OS X native Digital Camera RAW support from 10.11 El Capitan to 10.9 Mavericks?
Sticking with an older OS is going to leave you out of the loop on updates included in new versions. This is unavoidable if you are not willing to upgrade. For what it's worth, every older system that I have upgraded to El Capitan has seen some performance increases, in at least one case it was a significant bump in usability (early unibody MacBook that was barely usable in Yosemite is working beautifully in El Capitan).

Do a full system backup and give the newer OS a shot. It is difficult but not impossible to downgrade. If you can swap in a spare hard drive, and install from there, you won't risk your current setup just to check whether you can live with the changes implemented in 10.11.