Develop a better way to share karma among launchpad users

Launchpad is a largely volunteer led effort and as such it is import to recognize the efforts of volunteers. Karma is a simple way to show the extent of each volunteer's efforts. Currently, karma is only awarded when someone asking a question marks a single answer as the one that solved the problem. There are, however, examples where the combined efforts of several people need to be acknowledged. There should be a way for someone asking a question to mark all answers that contributed to solving the problem. In addition, not everyone posts a new question when needing help. Some (perhaps many) take the time to search for an existing answer. If an existing answer is close but more help is needed, should we encourage users to reopen these answers and ask for additional help or post a new question. In order to minimize repetition, it seems wise to encourage the reopening of answers. Unfortunately, it is not possible for anyone responding to this type of question to receive any kind of recognition as only the original poster can mark something solved. There should be a way for users other than the original poster to mark an answer as having helped. Without such a system, there is less incentive for volunteers to spend their time answering these types of questions and those asking will be pushed toward opening new questions even when one is not really needed and thus decreasing the overall usability of launchpad.