That is the commercial question about programme, and it is the only one a quantity surveyor has to answer. Everything else belongs to the planner.
A Gantt with four hundred activities is a planning tool. A Gantt with the works set against the date in the contract is a commercial tool, because it answers whether you are heading for an extension of time claim.
QScope draws the second kind. Contract period from your settings, today marked, and the sequence laid over it.
Time and cost are the same conversation held twice. A variation that carries two days of extension of time is not the same animal as one that does not, and the place to notice that is while the works are running.
Keeping the programme with the valuations means the progress meeting and the cost report draw on one set of facts rather than two files that disagree.
No, and deliberately not. The percentage you certify is your professional assessment of the work done. QScope will not infer it from a bar chart, because a programme shows intent and a valuation records fact.
No. It is a commercial view of whether the job runs past the contract date. If you use a dedicated planning tool, keep using it. This exists so the answer to that one question sits next to the money.
From the project settings: the start, the practical completion date and the period in weeks. Change them there and the Gantt redraws.
Yes, if you want them to. It prints alongside the cost report, and guests with view access can see it. What stays hidden from them is the cost report and the risk register.
Not your whole portfolio. One live job, one certificate. If it does not save you time the first time you use it, walk away and take your data with you.