I would add Spirit to the tutorials if the name of the site was The Whole of Spirit Half Life. But it isn't. We try to keep up to date with changes to common entity's and changes in the .fgd's but trying to keep up with every mod or game design change is not possible.
Spirit is a wonderful extension to Half Life. However it has not been used widely by the general mapping community. We try to give the members the rescources to map for HL with Hammer.
Spirit is sort of like owning an Apple Mac, great machine, but hey....
What you are trying to do ministeve is to run an Apple with the instructions from an IBM...... So don't get too pi**ed off if it doesnt work or that we don't support it. I would be happy to look at all the changes to the tutorials that you suggest, just send me the detailed text for every entity and how they change any tutorial and the additions to the tutorials.
Have you tried the support forums run by Spirit (are there any?) and have you read their entity guide?