Use of Skill Types and Project Role Types in the ofBiz Project Manager module

[Bertuzzi, Armando [Nervianoms]]

Can someone provide a clarification about use/meaning of Skill Types and
Project Role Types in the ofBiz Project Manager module?
The following are some of the uses of those concepts that are
implemented and that, with features currently implemented, seem
difficult to integrate.
1.      Each Person (Party) can have one or more Skills  (defined in
screen Party > Party Skills)
2.      In the Project Manager module, each Person (Party) can have one
or more Roles (defined in screen Project > Resources > Role(s)) 
3.      For a Task, the quality and amount of effort required for it to
be carried out are described in terms of Skills:  Skill Standards are
defined at Task level and are used to compute the Total planned Hours
for each Task and the Project as a whole.
4.      For a Task, the need of resources with time is  defined at a
Project's Task level in terms of Role Types: when Resources (Persons)
are assigned to Tasks, together with a From - Through date interval,
they are assigned to play a given Role Type (screen Project > Task >
Resources) . Multiple assignments date interval + Role Type can be
defined for a same Person to a Task. 
5.      When a Person enters Timesheet data (My Time screen) only the
Project/Task Name is required.  Neither the Role Type nor the Skill that
the person has played in the hours recorded in the Timesheet are
requested.
The separate use of  Skill Standards for Tasks (with estimated People
number, Duration and Cost) and of Project Roles for Resources assigned
to Tasks (with From-Through date periods) seems to make it difficult to
plan and monitor assignment of persons to Tasks with time taking based
on the type of ability or organizational role they play.
Any help and comment will be truly appreciated.
> Many thanks,
> Armando
>