When there is reduced thinking in a one door out of five sense doors ,which means if you have seen a pleasant thing and if no thoughts arise regarding them,Whether that apply to the other doors as well?what is that samadhi?in that case what is the middle way of it?
If I understand correctly what you are talking about... You are talking about the process of grasping a sign(mark) at one of the sense doors, and then automatically interpreting it into an desirable/undesirable object ==> harboring corresponding desire/aversion attitude ==> engaging in purposeful action towards that object ==> feeding craving, confusion, and illusion of self.
When we are able to catch ourselves at the moment when the sign(mark) is interpreted into an object of desire (or aversion), and stop that automatic reaction, we begin to get free from impulsive behavior -- and that eventually leads to freedom from confusion and the illusion of self.
Having learned to catch ourselves at that moment when automatic interpretation of sign happens on one sensory modality (=door), we can then more easily (NOT) do the same on all the other sensory modalities. When developed, this ability leads to what's known as the Diamond Samadhi (vajrasamadhi) - which is a name for when we do not lean (do not grasp) onto any sign.
From this perspective, the Middle Way can be explained as not taking a stand on any single sign - and being sort of "in between" (or "balanced") with regard to all signs (as well as the signless).
Is this what you are asking about or not?