[Dovecot] Multiple dovecot versions side-by-side

I'm current maintainer of dovecot packages in ALTLinux distro and I plan to make possible to install multiple dovecot versions side-by-side (1.0, 1.1, 1.2) to make upgrade process easier and more robust.

Is there any consequences of doing that? I worry about locking maildirs and mboxes, does dovecot handle it correctly if another dovecot process tries to work on same mail location?