Unfortunately sends not stored within track preset.
Also sends could not be frozen, they are always eat CPU or external DSP accelerator (UAD in my case).
Not the ultimate or elegant solution but DDMF’s Metaplugin can do some quite freaky stuff when it comes to connecting your own plug-ins in a modular enviroment. But it can also simply blend the signal (dry/wet)
And of course it’s a normal VST so it will be stored in a track preset.
Don’t let the clunky design fool you, it’s a poweful tool for people who like parallel processing and big effect chains.
I would much rather have the mixer behave the way it does currently. The very nature of insert routing is to affect the entire signal. When I need wet/dry control I will always route through a send.