Two issues here:
1/ not lifting straight off the catch with one finger on the inner lever
This is due to the catches on the lower door edge x2 being out of line, I find mine need regular adjustment to open easily AND not squeak constantly-in my own experience, i would get the correct torx key and learn how to do it, or you’ll be back at Renault monthly for what is an easy job
2/ doors slow to rise and need helping to lift to top (assuming windows or mods which add weight are NOT fitted)
This is due to the gas filled struts/lifters in the doors being set up with the correct pressure for warmer climates, but not having enough ooomph in our cold weather. Either complain en masse to Renault to get them to fit higher pressure lifters, or live with it until the cold weather goes away and they work normally again.
If you live next to your Renault dealer, then getting them to sort it is easy, but every single door torx bolt shakes loose with the vibration and unless they seal the threads with thread-lock, it will keep happening. I keep the tool in the dash and tighten them frequently.