'If you will/would…' : Extra polite?

[Tamara]

Certainly, it could be a more polite request to say

'If you will/would wait here,…’

if you’re a receptionist who needs to left a customer for some time to arrange something with other staff.

But wouldn’t it be 'extra-polite' (= sarcastic) if used in informal 'peer' communication? For example, among colleagues.

(Just to note: it’s a usual and general problem for foreigners to be polite 'adequately' – not too much, not inadvertently rude. Just sufficiently.)
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It’s impossible to learn swimming without entering the water…

[Mister Micawber]

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With a colleague or acquaintance, both are too formal, really. Something like Sit here a minute, OK? would do.

Being overly formal, however, is better than being underly so, and is certainly not necessarily seen as sarcasm or disrespect-- these are shown more in tone of voice and behaviour.
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Native English teacher at Mister Micawber's

[Tamara]

Thank you, Mister Micawber.