[Feature Request] optional flags with magit-like menu?

[starenka]

it would be nice to be able to set some session flags via magit-like "menu / transient buffer " while inputing the search term, wouldn't it?

i know i can modify the flags doing something like this:

(defun sta:deadgrep--include-args (rg-args)
  (push "--multiline" rg-args))
(use-package rg
  (advice-add 'deadgrep--arguments :filter-return #'sta:deadgrep--include-args))

but it is not so flexible as args set adhoc....