You can post a feature request at the forum at the above link. This is Adobe official site for feature requests and bug reports.
You can then post the link to your post to attract support from other users of this forum.
Are you saying that the feature I described is not supported at the moment?
Your answer is not answering my question.
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You can make a Preset that at time of import all images get added to a Collection. Make that collection the one that is synced with the LR Web/Mobile system.
It's in the right hand section of the import dialog, "Add to Collection", put a check mark in the box and select the collection from the drop down list. Then save a Preset for it, that is at the bottom of the import dialog "Import Preset:".