Is there a way to create non-R2
databases in an R2 database server?

不可以.一旦将数据库附加到sql Server的某个版本,即使兼容级别保持不变,也永远不会将其重新附加到以前的版本.

Am I only stuck with installing the
non-R2 sql server to run side-by-side
with my R2 database server?

是.