So as to move this forward I propose the following course of action.
I shall go through the (now) 144 questions and (1) re-tag any of them with a more appropriate existing tag, and (2) remove the control tag where it seems redundant given the other tags.
If it then seems to me, having read them, that @AdamO's proposed wiki does fit all the ones which are left then I will edit the wiki unless he does it first. If on balance the earlier suggestion from comments on my question, controlling-for-a-variable, seems appropriate i shall come back here and edit this.
======== edit 24 January 2018 ===============
I have now gone through them, deleted redundant tags, re-tagged with more appropriate (mostly quality-control, control-chart) and there remain 95. Of these eight are, I think, about control theory.
Estimating a first order plus dead time model
Gradient descent for a noisy system
Using dynamic programming with n-step ahead predictors
Template learning in Neural Network for control applicatication
Existence of ε-optimal Borel measurable policies in stochastic control
Deriving the particle filter with driving-force/inputs/control-signal
IoT - Sensor Fault Detection and Isolation Techniques using Fuzzy-Model
Why assume controls are independent of state estimation in Kalman Filter?
Since control theory is a mystery to me would someone like to confirm that. If they are I propose to re-tag them control-theory. It would then need a wiki.
Of the remainder there are quite a few about control groups and the rest about control variables. I think these are sufficiently distinct in questioners' minds for us to have separate tags. If people agree i will re-tag the control group ones and write a wiki and the remainder can be renamed as a block by someone with the right powers.
============ edit 6 February 2018 ================
This has now been completed with re-tagging and a new tag for controlling-for-a-variable as discussed in comments on the original question.