On behalf of Wolfram, who needs terms analogous to those created for activators. Namely:
to distinguish between "essential non-competitive inhibitor" and "non-essential
also a term for "competitive activator"
Added the following:
specific activator (SBO:0000533)
catalytic activator (SBO:0000534)
binding activator (SBO:0000535)
partial inhibitor (SBO:0000536)
complete inhibitor (SBO:0000537)
Probably the definitions could be improved a bit, but I will look again at these later.
Thanks to Lukas and Wolfram for working with me on these. And thanks Wolfram for the requests!