While I'm content with this being the first time trial with rewards that permits more than one car, I think it'd be nicer if we could eventually see more interesting regulations. For example, a limited selection of cars within a group, with either BoP enabled, or perhaps instead, a limit on either PP, power, and/or weight. For example, there was that GTWS Nations Cup Season 1 round where you could only use three modern LMP1 racers (and the GR010 LMH, seemingly taking the spot of the TS050 LMP1) at Le Mans. Another example being the current Daily Race A, where there are regulations on power/weight, as well as being limited to road-going FF cars at Blue Moon Bay. (Even if that Daily Race A is more like a Scirocco one-make at the moment.)
Similarly, you could have a one-make, but with BoP disabled, and tuning/settings enabled, much like the previous Daily Race A, where you were limited to the BMW M3 (E46) at Alsace - Village, but you could tune it to your heart's content.
I think there's a lot of neat potential for these time trials, especially now that there are rewards. For now, I'm fine just toying around with a rental GT-R Gr.4 at Dragon Trail Seaside. Last time I checked on Thursday, my time was within 3.19% of the top time, so I think I could potentially get gold if the top time doesn't get much lower. Heck, even if I do get silver, I can't say I'd turn down 1m credits.