I currently have a first life monk that I extensively worked on favor (including challenges) and have no intention of ever tr'ing until they have an option to preserve favor. Plus I'm not all that keen on the whole tr thing in the first place. As far as heroic tr goes this isn't a huge problem, as none of the past life feats are truly overpowered (with the exception of +9 spell pen from 3xwiz, 3xfvs; however, this isn't relevant to my melee).
So please devs do not make the epic past life feats super powerful and not have an option to not reset favor for epic tr only. There should also be the realistic option to never tr and still be somewhat competitive. With relevance to your suggestions, 3 x stacking 10% to cure spells or the proposed bonus to two-handed or two-weapon fighting are very powerful. A mass charm song with 3 min cooldown and blind fighting are nice but in no way overpowered.