Just testing with rpmdev-vercmp and [reading this](http://fedoraproject.org/wiki/Archive:Tools/RPM/VersionComparison), it seems that `1.19` is newer than `1.1stable`.  The trouble is the reverse, as `1.19` is newer than `1.2` or `1.2.0` (my preference for the next release version).

How about `1.1.9999`?
<pre>
$ rpmdev-vercmp 1.1stable-3.el6 1.1.9999-1.el6
1.1stable-3.el6 < 1.1.9999-1.el6
$ rpmdev-vercmp 1.1.9999-1.el6 1.2.0-1.el6
1.1.9999-1.el6 < 1.2.0-1.el6
</pre>