I couldn't see that patientior can govern the noun. Thanks for the link! Just to check, the genitive of permanent attribute can focus on a different sense of the verb patior (and its derivatives) from the one used with an accusative noun?
Comf. the pair:
vir patiens onus grande (A man carrying a heavy load)
Caesar laborum patientior fuit quam credi potest (Caesar was incredibly)
Yes, patiens can be used in both of these senses. Context should make the meaning clear.
Ita, verbum patiens utrasque sententias habere potest. Quod verbum significet contextus ostendet.
Here are some examples that may show what the book means:
"vir patiens onus grande"
"vir patiens onerum grandium"
The first just means that the man bears a particular heavy load, his backpack or grief, for example. If he sheds his burden, then he is no longer "patiens." The second example suggests that this is a man accustomed
to bearing heavy burdens, perhaps because he is a slave or has experienced much hardship. It is a character trait, regardless of what he's up to at the moment. (These are my own examples, so I hope this distinction works here.)
Forsitan haec exempla sententiam libri exprimere possint. Primum dicit virum aliquod onus ferre, exempli gratia, sarcinam doloremve. Si onus deponit, "patiens" non est. Secundum exemplum dicit virum onera ferre solet, ei hoc est adsuetum--fortasse servus est, vel multas calamitates patitur totam vitam. Hoc viri mos est; non refert quod faciat. (Mea haec exempla--discrimen bonum esse cupio.)