So far (aside from how we want to deal with the anger) the proposals for future son modifications have have been:
TRAINING:
>5383085+Get them endurance to acting in strong null fields (we plan to sever ourselves from the Warp)
>5383110? Are we Techmarines? Does the concept exist? Can our sons all become Techmarines by sending them to Forge Worlds during peace?
BODY MODS:
>5383085+Encourage Cyborgization to be like us
+Do not limit yourselves to your original dimensions (try to get everyone to be taller/stronger. arms and legs can be built stronger than the original form)
+Check if Acillians are more resistant to mutation because they employ less actual geneseed from the get go (we did this in thread 1)
>5383085>5383106+Enhance the Ossmodula and Biscopea so our sons can grow bigger and stronger (I interpret this as also being equivalent to achieving Sons of Anteus/Storm Giants - also we did invent the Magnificat so there may be something there for us too)
+Make the Progenoid Gland grow faster for faster marine recruitment
>>5383143+Research null organs / pariah gene integration
>5383177+Brains into Chest for extra protection
+Better Brainstem/Implant interface via the Nervous System for superior bionic control
+More secure lines of private beam communication (and a cool laser eye!)
+Weaponry that can fire via the users mind rather than the trigger (could be more accurate)
+More compact lung/respiratory tract via tube system (agree with anon this could be a great precusor to Iron Lung from Metallica)
ARMOR
>5383104+Jermanyze our Armor aesthetic (For Lucian Sector Skitarii too)
+Make Armor more modular to account for increase in size/cyborgification of marines who may not fit their original dimension
+Can we get to work on Terminator research?
CULTURE/MINDSET/OTHER
>5383085+Dreadnoughts to be seen as a holy and desirable machine form (to become one with the machine is the major goal of all Cult Mechanicus)
+Make being a Dreadnought less shitty: let them stay awake between battles, give them organs and tools to interact with the world like mouths to eat and 'dendrites for even more hands for research, holograms to display their old bodily form. Basically all the stuff a very machine like techpriest could do
+Establish such good Dreadnought care that many of our Elites may want to preemptively become Dreadnoughts
If I've interpreted your proposal wrongly or missed anyone please correct but this is what I've observed thus far.