According to the 3.3 docs, this function in the ™ module is no longer needed. Is this correct?
If so, should someone remove it?

Hmm. All mentions of ™ gets automatically converted to a trademark sign in my mailer. I mean the T M Module :-)
/O
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1.4.6. delete_timer (integer)

Time after which a to-be-deleted transaction currently ref-ed by a process will be tried to be deleted again (in milliseconds).

Note: this parameter is obsolete for ser 2.1 (in 2.1 the transaction is deleted the moment it's not referenced anymore).

Default value is 200 milliseconds.

Example 6. Set delete_timer parameter

...
modparam("tm", "delete_timer", 100)
...