Tasks' additional properties for future use in Gantt and SADT diagrams

Markup principles feature or add-on for values of time and money consumption of a task along with assignee as a resource and subtasks as input for future use in Gantt and SADT diagrams. Example of a new task: Drawing concept-art stills for the project presentation - @theselectedartist time:2w/pub money:-200USD upon:(#artistselection + #artistcontraction), where: Drawing concept-art stills for the project presentation is an actual task name, which is visible for everyone including outsourcers; @theselectedartist - is an alias (or a role) of an assignee, which is not known yet and will be assigned to the role later; "time:2w" is time in weeks in this case, which is needed for an assignee to complete the task i.e. time count since the moment when the assignee (as a resource in terms of SADT) is free to start completing the task and actually moved the task into "in progress". other principles may apply for tasks, measured in hours. /pub - makes the resource visible to anyone, who is allowed to see the task; "money:-200USD" is an amount of expense upon completion of the task. can be positive due to the nature of some tasks, i.e. when we receive payment or it's we who is assigned for incoming task; "upon:(#artistselection + #artistcontraction)" - is requirements description, that means that both tasks in brackets must be completed before starting the task (the two tasks should be created if not existing are chosen). P.S.: I've been using the service for just a couple of days and it's really good as is. All the above is just something I haven't come across anywhere yet. It's not actually a 'request', more a thought or an idea, that might be useful for future development.