Preseting tyre temp? That would be great, but ideally, it'd have to be a slider, with some cars you have to start with lower than opt temp, since the tires will heat up a great deal during the lap, while with others, you may want to select higher than opt temp (think UF1, MRT5). Since a starting tyre temp would be clearly visible, noone would be at a disadvantage.
As far as lays go, I fail to understand the point in skippy's post. Surely, one can make a layout with modified start point, what's the problem? There will be only one split with limited placement point (since you'll have to cross it on the out lap, so you'd have a full timed lap and not a full lap+start to finish line). Now, that is the only flaw with this configuration, and in my opinion - it's nothing. When you qualify - the only thing that matters is the final laptime, and you can train different sectors separately. The (possibly) easy fix for this whole situation, that comes to mind is simply to make some option for the first lap to start to count when the player crosses the finish line, instead of starting to count right after the lights, like in hotlap. That may be usefull in some AutoX layouts too, actually. And it'd work online, so no limiting to hotlap mode.
But if layouts were to be allowed in a hotlap, in my opinion, it would be better if those hotlaps were to be disallowed to upload to LFSW in any form. I'm thinking about placing some markers (conus, white lines) for braking points, apexes (AS3r last corner, would help a lot). It's bad enough with "4" helper in multiplayer, I know guys who wouldn't hotlap only because they just can't drive without that line. Contr-argument would be that those layouts would be accessible to anyone, so again, no disadvantage, but I really hate the idea, that we may be hotlapping with this aiding conuses, that's really not in the spirit of hotlapping.