Alt build mode for belts: Force 'Only Ramps' or 'Only Elevators'

Early game belt slopes are great but early-mid game i tent to build only belt elevators.
When routing transport belts across different heights, the planner defaults to ramps (slopes) on E/Q.
I suggest adding an Alt/toggle mode (or dedicated hotkey behavior) that forces the tool to place vertical elevators instead of ramps. So when in this alt mode, pressing E or Q would create an elevator with +/- 1 height instead of a +/- 1 height ramp.
This would solve the tedious of going out of the belt planner, put the elevator, return to belt planner, to build continuous belts.