Concerning crank case venting:
On wet sump engines (not the R3) it is required to have some amount of vacuum to pull the air out, it keeps the sump area cleaner and avoids pressure build up.
On dry sump engines (the R3) is NOT required, as the rank case will already be scavenged and is always at a low pressure. It also has a pressure relief built in to avoid too much vacuum.
That out of the way, its NEVER a bad idea to pull on the crank breather like that, period. You wont get oil up it (barring any mechanical failures) and cylinder #2 is the richest running cylinder, so if you're going to vent it to intake, that's the proper way to do it. The ONLY engines that need even give it a second thought are Carp or Nev motors with top AND bottom end done, even then, its really a massively minuscule chance to effect anything in any negative manner.
If a 2.0 DOHC 24v i4 motor with 10.5:1 pushing 25psi can run with it the sump vented to intake with ZERO detonation issues from the oil for 60,000 miles, then an NA motor with nearly identically shaped chambers and valve angles will have no issues. Anyone who thinks or says otherwise is using flawed knowledge, kind of like "you need back pressure to make power", it's mis-application of partial knowledge. I would however, recommend putting in an in-line PCV valve to between the crank case and intake so the air can only flow from case > intake and not intake > case.