I'm glad you asked the community what we would like to see, therefor i can share my wish swirls within me for weeks. After peakmonsters released the feature autobidder i felt like that way they were just pushed splinterlands rentals in the bad direction. I think the problem should be approached from the opposite direction:

It would be so great if we could create rental options with the wanted card and a price we willing to pay for the daily rent. Therefor if i would like to have a specific deck to play with i could set up my rental wish, and if someone would willing the rent out for me the specific cards for the price i'm willing to pay they would initiate the renting not me browsing the market what is currently available.

So in short, if I'm looking or some specific cards, i would pick them, set a price i would rent them, and set a target date, until i would like to rent.
Therefor if i would like to have a deck until the season ends, i should not modify the renting days daily, in case some cards wouldn't rented on the first day i created my "renting wish".

I hope its understandable. Can't wait to see your answer if it's a good idea or not.