IMO adding an inline valve is about as simple as modifications get, but suit yourself.
I only responded because your comment seemed to imply that lubing the seals alone would make a big difference, and you just discovered that it did not. I just wanted it understood, that is not what my posts say, and to make it clear for those that do want to significantly improve brake pedal feel and response, they have to do both steps.
IMO properly greasing the piston seals is actually a lot more work (if they are already installed), if that is already done adding the inline RPV's is a very simple modification. Given all the time, effort, and money already put into these brake modifications, to not do these relatively cheap and simple adjustments just seems a shame to me, but if you are happy as is, to each there own.
Cheers
It got me back to the feel of the stock PP's, I'm good with that.
My PP fronts are now on a non-PP car and feel the best of any factory setup I've felt. It seems to me non-
PP rears have a big affect on brake feel too.