I can tell you how to disable it if you feel up to editing the mod :) If you have not yet researched construction turrets, this completely removes the option (if you have, then it's more difficult)
While not playing factorio, open the file repair_turret_2.0.0.zip in the mods directory (you can just click it to open), and go Repair_Turret_2.0.0/data/entities/repair_turret
Edit the file repair_turret.lua (using notepad)
search for this section:
data:extend
{
turret,
item,
repair_beam,
deconstruct_beam,
construct_beam,
technology,
can_construct_technology,
recipe,
projectile,
explosion
}
and change it to this:
data:extend
{
turret,
item,
repair_beam,
-- deconstruct_beam,
-- construct_beam,
technology,
-- can_construct_technology,
recipe,
projectile,
explosion
}
Happy gaming (an option to do this would be so much better though) !