Ah yeah, I have just seen the EDIT you have made. Yes, my parameters are set for 150 px as I need that properly filling out the space on a) the website over desktop and b) over the app. If I leave it to 320 px, it looks less than beautiful on phone (it re-arranges to be a single line downwards) and if I do it less than 320 px it looks on not good activity...
Considering that you need to consider (awesome english here...) that people also use the stuff on mobile phones, different plugins, different set-ups, it would be great to have different settings that do not intermix (one for activity thumbnails and one for gallery thumbnails)... It is a modular build-up so each module plugin should, if possible, have its own settings... that would avoid the above situation (perfect size and shape etc... for gallery, break-down on activity....)
Bye
Tim