To answer the surface question — no:
All contributions are licensed under Creative Commons […] If you are not comfortable with the idea of your contributions being collaboratively edited by other trusted users, this may not be the site for you.
Effectively, a post is “owned” by the community.† When it comes to what the question is asking it is pragmatic that the poster has final say about that (though we have exceptions even there) because we're here to answer real questions, not what we might wish people would ask. But when it comes to details of the post that amount to site-management, both the rules of the site and pragmatics mean community standards trump the post author.
To answer the unasked question which is actually at issue:
No, we don't put tags in titles when we can at all help it. “[question] in D&D 3.5e” and “In D&D 3.5e [question]” are both proscribed title formats. As that is a site-management issue, the author wanting to staple the name of the game onto the front of the question doesn't trump community management rules.
As a rule of thumb, if the title can still be a comprehensible title without the game's name in there, it will be edited out. The only exceptions are when it is integrated inextricably into the grammar of the title and removing it is not possible. Since it is trivially removed in this case, it is not organic to the nature of the title.
Keep in mind that anyone on the site can see the tags, and anyone seeing the question on Google will have the most popular tag on the question automatically prepended to the title, and dnd-3.5e - In DnD 3.5 can you see the moon with the spot skill? showing up on Google makes us look like a bag of illiterate gerbils. The only place where no tags are visible either attached to the question nor prepended to the title is in the Hot Network Questions list, but we don't alter our titles to serve that view if it does a disservice to the two normal views (site and external search).
† The legalities are more nuanced. Legally, the community has a non-exclusive, irrevocable, permanent license to the version submitted to and hosted by the community, and has full rights to alter it regardless of the wishes of the author. That's not technically ownership in the legal sense, but for purposes local to the site is effectively ownership in the pedestrian sense. The author retains full rights to their original version, which they can do with as they like elsewhere, as they hold the actual copyright. So in common (not legal) parlance the community “owns” the specific copy of the content hosted here on RPG.se and the community's rules apply fully to it, but RPG.se can't stop the author from using it elsewhere.