Ok, guys, who is first to post some impovements?
I don't have the model yet, but I am curious to see other people's ideas!
So, go for it!!!!
Update (08. June 2016) of the already know topics (listed and rated by Kumbbl):
Blakbirds Step-5-MOD (http://www.eurobrick...75#entry2575969): Fixes the probably strongest issue, the way too much friction in the drive train preventing the whole model from working - fixes a mission critical issue
Attikas change-over-catches-fix (http://www.eurobrick...50#entry2579365): Fixes the probably second strongest issue, the double engaging issue which blocks the whole drive train - fixes a mission critical issue and makes gear switching quite 100% reliable
supertechnicmans fix for the infinite gear shifting issue (http://www.eurobrick...25#entry2577440): This issue is not mission critical but annoying
Paul Boratkos fix for the wrong gear sequence (see Jim review in the first posting which explains the solution): This issue is not mission critical but annoying. A sequential gearbox shoud change gears in 1 -> 2 --> 3 --> 4
Didumos69' fix for the missing HOG (http://www.eurobrick...25#entry2581074): the steering wheel inside the cabin is quite unreachable for a male-hand... so this is not really mission critical but at least very annoying. So this fix adds great value to playability and it is well braced and well integrated so it does not pollute the great look of the car
Max supercars fix for the 4R problem (http://www.eurobrick...25#entry2578360): This is not an issue at all but a very unrealistic implementation of a gearbox. This fix makes the whole gearbox way more realistic
Jetros MOD for easy unmounting/remounting the bodywork (http://www.eurobrick...3): Not an issue but enhances the value of the model a lot because only without bodywork all the inner workings can be watched.
Kumbbl: "Until this MOD-state the 42056 results in a very satisfying model. So i would call these 7 MODs the essential MODs which should and could be applied by every owner with more or less zero additional costs."
06.07.2016: And here is the link to the "Ultimate playable version of the Porsche".
15.07.2016: Didumos69 made a nice sum-up in a separate thread.