Some QSetting Questions and some more...

[aguayro]

hi, i have a question:
there is any problem if i use QSettigns to write settings "on the fly"?
i'd like to save a setting value whe the user change the text of a QLineEdit
is this a bad practice or something?

Question 2:
What is better FOR PERFOMANCE, a lot of QWidget->setValue("Secction/Sub").toInt(); ( for example )
or an "intelligent coded based/dynamic engine" like:
( with pseudocode )
for (int x=0; x<MaxWidgets; x++) {
QWidget->setValue( "Function that assigns section name using Widget name" ).toInt();
}
(same question for saving settings)

another question, so i have not to open another thread:
there is any way of making make a checkbox uncheckable, via QT Designer, if a radiobutton is not checked? ( its easy to do with code, but maybe there is a fastest way with QT Designer )

Thanks for your time