I am currently using Mantis to track bugs on my projects and I like it. Using special categories etc, I use Mantis also for tracking new project requirements. I don't feel comfort with this workaround since when I add a new report, many text fields I am prompted to fill are bug related.
My other alternative is Bugzilla but it is much more sounding bug-related.
I have to use only one tracker for my SVN configuration etc.
Edit:
What should be the right direction to go for a single developer/multiple projects?, or it is OK to keep mantis?