1. In general no, refuelling offers more tactical variations. As an optional league choice it would be fine as it would add the chance to mix things up once in a while and also would be one key element to replicate F1 seasons of the past or other racing series. I wouldn't put it high on the priority list though.
2. That one can be done already by league rules. Again, as an optional league choice it would be nice to have to make things easier for everyone in leagues with that rule, but even less priority points in my view.
3. No. I fully go with the reasoning of the devs that this kind of prices bears the risk of strengthening the already strong teams further and this would be counterproductive to have close, challenging and interesting races. Wouldn't mind some more visual fluff like a collection of trophies, though.
4. Yes, currently the sponsors often look too tiny and out of place on most liveries, so some options to move and resize them slightly could improve that. Perhaps also some colour (incl. transparency) options for the background on the ones that are not complete logos.
5. Expanding the name database is an ongoing work in progress, feel free to suggest appropriate names for it here:
https://igpmanager.com/forum-thread/14862
Also you can customise names for a few token.
6. I don't mind how it is and eye candy, while nice to have, quickly wears off, but I do see a point here as the first impression is important for a game, especially a phone app one, so I suppose it's something that needs to be addressed at some point.
7. No. Actually currently the financial stress is worst somewhere in the early mid-levels as there the need arises to replace staff asap to keep, or often gain (some), competitiveness in upper tiers, HQ upgrades is (still) a constant drain and, until the Youth Academy is finally built up, there's only very limited access to good and cheap drivers. After that phase financials becomes a very easy thing to manage, or, at least, if the need or wish arises to keep 3-4 CDs to max out and customise the new car design to the last point, not a real problem. So here quite the opposite is true: With rising levels we actually could need more money drains to replace the build up costs of HQ, hiring costs and, to some extent, wages, but that's a different topic.