Take a look at the Hose cuffs on certain Dyson uprights like the DC07 and DC14. they have holes, so you can push the tools in all the way, or just a bit. The airflow holes in the crevice and stair tools also help with this.
The Dyson handheld models after the DC30 (not DC16) have a boost button.
The Dyson DC04 clutched model's hose cuff has a semi-circle release button for the wand, and a circular button for suction reduction.
The Dyson DC01 and DC03 for example didn't need this.
The Dyson cylinders, however have a manual suction release valve which the user can optionally choose to reduce the suction or not, again similar to the DC04 clutched model's hosecuffs.
The Dyson DC12 does not have an electronic suction reduction feature.