If you jump but do not release LMB you will not grab anything unless you release it first (though that one is because I thought you could hold LMB to grab stuff as soon as it was possible to grab something)
The grab range I personally thought was surprisingly short and I sometimes was unable to judge if something was in range and/or possible to grab (having like a transparent version of the hands show up on whatever thing that you can grab if you aim your mouse at it or something)
Making it possible to set mouse sensitivity wouldve been awesome