Correct. On the Q400 if you find yourself in a situation where you have to land with a non standard flap setting e.g flaps fail to deploy, on some of our shorter runways like SOU, BHD, JER, IOM, GUR at heavier landing weights you can find yourself getting close to needing all the LDA especially if landing Flap 0. If the runway is wet we have to increase the figure in the checklist by 50% which at places like SOU can result in your LDR > LDA (SOU~1700m) resulting in you needing a longer runway somewhere else. Also if it is ICING conditions, and you need to do a icing system ON landing, that adds even more onto the LDR.
Hope that helps.