Is there some flexible "flush floats" recommendation command (similar to pagebreak[priority])?

Two questions on one subject:

1. Is there a command (in the standard packages) to suggest flushing floats after that point with some “priority” value ranging from “suggest” to “force” (similar to pagebreak[priority])?
2. Do the default LaTeX sectioning commands add such commands (so that floats tend less to accumulate across sections, subsections, etc.)?
   Only chapters seem to flush floats.