Some HMI & function improvement

Week view :
It could be great for us to have a week view of activity instead of day view. For example the real work could be display per week instead of day by checking check box week/day.

Which screen are you talking about ? Real work allocation ?
If so, then answer is no : real work must be entered day by day. It is a basis of work follow-up in Project'Or RIA.
If you wanna have weekly view, then somes reports can give you this.

Adding Week number
Add week number in calendar during activity record

Which screen ? Which field ?
Do you mean the date fields, with calendar view, in Activity screen ?
If so, then anwser is no : Project'Or RIA uses a dojo widget (dijit.DateTextBox), which does no propose to diplay week number.

Plan per resources
Add filter to display only one resource (by default the user )

why not. But is is also very easy to close all users and open only one...

Project per alphabetic
Add check box to sort project by alphabetic instead of WBS. I don't know if it's possible because the lower level (activity) must be always under level of affected project to check...

If your're dealing with Planning screen, then answer is no, as you explained. Also consider that projects can be sub-projects of other projects, so alphabetic sort is not pertinent.

Yes, in fact you could add (if you whant ) planned work for the week at the end of view.

Planned work is already displayed, day by day.