Not sure how feasible this is but I have an idea for improving the current query system by adding IF conditions to it based off variables or tab names. I use IF functions a lot with data and think actually by having them affect the query state, it would be easier in some cases.

Using a tab name to set a variable (this came off the idea of a different post about tab names http://forums.visokio.com/discussion/2680/idea-tab-links-accept-variables-for-resolving-tab-linkss)

IF(
Tab= "Tab_1", SetVar [VariableName] = "VariableOption1",
Tab= "Tab_2", SetVar [VariableName] = "VariableOption2"
)

OR using a variable to set filter conditions:

IF(
VariableName= "VariableOption1", set field filter [PostcodeSectorField] ="HA",
VariableName= "VariableOption2", set field filter [PostcodeSectorField] ="WC",
)

Also to use existing premade queries:

IF (
Tab= "Tab_1", Use Query state = "QueryName1",
Tab= "Tab_2", Use Query state = "QueryName2"
)