Hi!
In my opinion, the first concern should be attitude regarding environment and enforcing the fishing regulations. Kids are walking around, and they can get the wrong idea.
The number of fish you can keep doesn't matter because anyway they are stocked. A lower number in quota would be respected only by the regular fisherman, and make the lake more appealing for "the bucket brigade".
My opinion is to stock the lake with bigger sizes trout, more often, and in smaller quantities.
Would be great to empty the lake, clean it, lay it with a proper bottom (increase shore length, accessibility, depth, soil, structures etc), but sounds more like a dream...But this way you can effectively triple the potential of a fishing lake...
Is there such job like "lake designer"?