Many ISPs apply limits to download traffic but not to uploads. Would it be possible for BOINC to apply separate limits too? Does it even make sense to do so?

You may have to qualify what 'download' is understood to be. Is it files, or is it anything including pages in the web browser? Is your BOINC downloading all or part of total traffic... if you have multiple devices running, how then to subdivide the traffic in each of the clients settings?

My ISP plan has unlimited traffic (28 Euro/Month incl. national unrestricted calling and TV streaming) and the 4G plan is 10GB/Month used for the tablet. Have this 4 months and yet to crack 1GB.

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Coelum Non Animum Mutant, Qui Trans Mare Currunt

To the ISP, "download" is any traffic passing through their networks to the subscriber. To BOINC, it's data packets coming in for analysis. Conversely for "upload".

I have two devices running, one of which is puny. Each local config can already set its own limit on traffic, so this doesn't affect my question.

So far in May I've used 55% of my calendar-monthly 50GB allowance, since I succeeded in getting ATLAS@home running (I never used more than 50% in a whole month before then). I wouldn't run BOINC on a phone or a tablet myself; I don't think they're man enough for it.

But it was a general question anyway. Would it make sense to apply separate up and down limits, and would it be reasonably easy to do? It doesn't sound hard on the face of it.

Since it makes no difference how much you upload, a tickbox to only measure download would be sufficient. Now, we can want all we want, but unless there's a volunteer to implement such a feature, low hopes it will come to fruition, so 3rd party tools such a DU Meter that can alert on total BW download use may be a better bet, instead of having to figure out how much each client's period DL budget is.

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Coelum Non Animum Mutant, Qui Trans Mare Currunt