I looked back through quite a lot of pages and couldn't find ''studding beetles'' as a suggestion.
Wouldn't it be great to be able to stud out beetles? With rarer beetle species, I often have a hard time finding the same rare beetle, and since beetles have a short window to be bred (20 days, not including larvae stage) it can be hard breeding rare beetles. Even if you don't have a rare beetle, studding would still be beneficial. For example, the stud could be the only beetle with higher stats and/or a rare color available for breeding. I know beetle genetics aren't complicated, so this should be easy to implement.
Beetles can gain stats from their parents (stats are added up from stat boosts). I know most people aren't super into beetles (1194 votes said they did not battle their beetles in the Archived poll votes), so if this feature was added perhaps beetles would be seen as more useful.

[edit]
Studding would also be fantastic if you didn't want to sell your beetle for others to use. Studding could potentially add ''x number of offspring'' but this isn't necessary. Male beetles should have breeding slots (15 per week).