Can multō modify a verb

Question

If you wanted to say: 'I don't like brown very much' could you translate that as: "Brunus nōn mihi placet multō". More generally, can 'multō' be used to modify verbs? Looking at roughly the first 30 sentences which use 'multō' here

latin packhum

The only instance I see which might lead one to think that is from Seneca:

Seneca

mali rursus non effugiunt inpietatem, quamvis aras sanguine
multo cruentaverint

Which I think means: They could not escape the wickedness of evil, although the altars were stained with blood.

I couldn't figure out if 'rursus' meant 'backwards' or 'on the contrary' and I can't figure out what 'multō' modifies. If it modifies 'aras' then why is 'multo' in ablative and 'aras' in accusative plural. If it modifies 'curentaverint' then maybe it means:

the altars were heavily stained with blood.

######UPDATE

In light of the suggestion of 'multum' rather than 'multo' I found this sentence from De Bello Gallico

quibus ad pugnam non multum Crassus confidebat, Caes. BG. 3, 25

Answer 1

Looking at the L&S entry for multus you can see that there are two adverbial usages listed, multum (section I.A) and multo (section I.B). The first is freely used with verbs. The second occasionally occurs with verbs, but apparently only when the verb has some kind of comparative meaning, as in multo mavolo/malo "I much prefer" or multo anteponentes "greatly preferring". You could even argue that in such cases multo is not directly modifying the verb but the prefix: multo malo = multo magis volo "I want much more", multo anteponentes "placing greatly ahead". So in general, and in the specific case you ask about, multum seems like the better choice.

In your Seneca quote, as other commenters have pointed out, multo is not an adverb but an adjective agreeing with sanguine.