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Please revert the change from 1.2 to radial decouplers (TT-38K, TT-70, Hydraulic Detachment Manifold) that prevents the 'toggle crossfeed' from showing/working on radial decouplers until one has researched the Fuel Systems node. I actually thought this was a bug because it used to work before, and all other decouplers/separators/docking ports have the 'toggle crossfeed' option at all times, including the TR18-A stack decoupler which is available even before the TT-38K. Only after searching the forum I discovered this was introduced on purpose during the 1.2 update - the rationale we got for adding this weird exception was as follows: I do not understand why adding this strange exception was considered necessary in the first place: fuel lines have their own use cases that do not depend on decouplers being able to crossfeed or not (for example, 'proper' asparagus staging requires the one-way fuel lines if you want radial stack engines to cut off when they've expended their 'own' fuel, instead of continuing to feed off the other stacks due to crossfeed across decouplers being bidirectional). But disregarding any possible explanation that I can't think of, the way it's implemented now it completely fails to achieve the intended goal, since the FTX-2 fuel ducts whose 'relevancy' is supposed to be protected by this exception are not unlocked until that exact same R&D node! In other words: the fuel lines do not even become available at all to be or stay 'relevant' in any way... until the exact moment when the 'toggle crossfeed' option on radial decouplers is unlocked; which according to the logic used to introduce this change, makes them immediately 'irrelevant' as soon as they are available. So, hereby a heartfelt plea to please undo this weird exception that obviously does not actually do what it was intended to do (while adding limitations to the possible uses of the early radial decouplers). Alternatively, if reverting this change is absolutely out of the question... at least move the FTX-2 fuel ducts to a much earlier node (I suggest the same node as the radial decouplers, since them not allowing crossfeed yet would be the main use case for the ducts), so they actually have a chance at 'being relevant' during some time until the radial decouplers are deemed worthy of 'toggle crossfeed'.