We would like to get a Gantt chart of milestones from several projects.

Here's the original use case:

I'm responsible for our project portfolio. A customers wants to have a
status meeting regarding all our ongoing projects for the customer. I'd
like to be able to open a task list of all the projects for a chosen
customer, then to only show the Milestones and finally open a Gantt
chart to visualize the information.

Thinking more broadly leads to this use case:
* I'd like to select a miscellaneous set of projects by cross-marking a
selection box at the front of a project's row.
* I'd then select a Gantt view and filer it to display only milestones (or incompleted milestones)
* With this more generic solution, I'd satisfy the above original use
case, but I wouldn't be bound to only show the projects of a single
customer. Instead, I'd be able to select any set of projects.
* The resulting view could be close to the currently available Gantt view, and in addition to that, it could provide a "condensed view", where each project is represented with a single line in the Gantt chart and the project's milestones are drawn on top of the project's bar in the chart. Each milestone's information (name, status, date) could be presented with a mouse-over action.

Please note that the 'Milestones by project' report already available in PlanMill isn't sufficient, because it's difficult to get the overall picture without the timeline (Gantt).

Note for PlanMill staff: This topic has been discussed via email with you. For more information, please check Request ID 967371.

The Tasks->Gantt view is a nice tool for viewing all the milestones of a project portfolio, or a branch of the project portfolio. I'm use it like this:
- Go to Portfolio space 'XYZ Projects' -> Tasks -> Gantt.
- Set filters:
-- View by: All not completed milestones
-- Zoom: Quarter
-- Start from today: Yes
HOWEVER:
The list of milestones for a project portfolio (or a branch of it) is long and all of them do not fit my screen. When I scroll down, the Gantt view doesn't show me the "column headings", i.e. Month/Quarter names at the top of the view. Also, when I scroll along the timeline towards right, the task names get lost to the left.
I suggest you use the "freeze panes" kind of solution familiar from MS Excel and make all the column headings and the leftmost 1-3 columns constantly visible for the Gantt.

Currently, PlanMill doesn't remember the user's previous inputs to the the "Comment" field in Time view / time sheet. However, quickly entering an identical comment as last time you were working on "task X" would save a lot of user's time and would make invoicing more coherent. We do not want to create a task or request for every single thing, but instead want to keep the project's task list rather generic (based on project templates) to save project managers' time. The customers and project managers on the other hand have a natural need to know, what exactly did those 4 hours booked for task "Intergration" mean.
PlanMill could remember users' inputs per task. And other users' inputs would be available for all users reporting time for the same task. This way users' comments would look more similar and other users would save time after one user had written the standard comment for the first time.