About "Trusted Server Certificates" of "Route Via Http(s)":

Document ID : KB000103205
Last Modified Date : 30/08/2018
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About "Trusted Server Certificates" of "Route Via Http(s)": 
The default is "Trust all Trusted Certificate". 
Is it possible to change the default of "Trusted Server Certificates" of "Route Via Http(s)" for each setting of Role?
CA API Gateway - 8.x
CA API Gateway - 9.x

It is impossible. 
API Gateway deos not have that function(or configulation).
Also, Role is authority to operate on the PolicyManager.
As such, the role does not affect the default values of each assertion.