We do have adding your subjects on the wish list. While that’s not what we’re working on right now, it is on the priority list to consider for the future. Doug gave some insight into how we choose what to work on in this post last week.
We try to keep the subject list as small as possible so that it doesn’t become unwieldy. The rule of thumb we use to decide if a new subject should be added is if there isn’t already a subject the topic could fall under. In this case, Logic would fall under the existing subject of Personal Development, so we wouldn’t add another subject to cover that sub-topic.