Nutz,
You can do whatever you wish.
However, each two runs comprises a record attempt. One qualifier and the backup for the average. To answer another question in this post. It is the average that determines if a record is set. The second run can be slower than current record.
My case in 2004: record 221, qualify at 232, backup at 219(driver talent involved here), record 226. Club minimum 230, I had to do it all over again for the hat qualifying on the 226 this time.
If you leave impound between attempts you lose the first run.
If you want to use each run as a qualifier call Mike Cook, that is allowed in FIA competiton.
DW