On completing a quest from a questgiver, if the reward is going to be a local Q increase I think that this reward could be made much more enticing if you were given a small list where you can select a single thing that you'd like to have the q of increased, somewhat similar to the menu that appears when you're trying to do lure fishing, with the amount of options available being based on a similar formula to the options available for lure fishing. Perhaps these could be based on CHR and Lore?
This suggestion also goes hand in hand with the previous suggestion to have Local Q Increases be made to the actual Thingwall province and stored within the Thingwall itself, rather than the easily killed quest tree/boulder, which has now been made several times in various threads in and out of C&I.