My vote is to keep it the way it is with immediate return run for record so as to continue racing the rest of the day
that's why my wife and I do it is to come and ride as much as we can.
For the first time, I attended both BMST and WOS this year. I went as a competitor at BMST, but as a Tech inspector at WOS.
I, like you, was always quite happy to be able to get my return run almost immediately so I could go out and try to bump my own record. At one meet, I had to make three down runs, qualifying for a record each time, and three return runs before I got the record. First return, the carburetor came loose, second return resulted in running just off course at the return mile timer, and thirdly being successful.
So at WOS, I noticed that as you say record qualifiers had to wait in impound until the next morning. But one team had the remedy. I met Allen and John Levie who brought not just one but three machines - - an open 175cc turbo charged bike, a side car kneeler, and a sidecar streamliner - - all in one trailer! Qualified for records in all three classes which took most of the day. Came back the next morning and made two successful back-up runs while the kneeler's motor failed. They spent the rest of the morning changing classes and qualified for two more records that afternoon in Gas classes rather than the Fuel classes. Came back the next morning and were successful in both those changed classes, so set about changing classes again, the streamliner back in gas to try to bump its own record, and by adding a sidecar wheel to the open bike, both changes which were successful! So six records in 2-1/2 days. The moral of the story is that you can keep running at SCTA events, as long as you bring extra machines.
Tom