You will need to let people reconstruct toons
I realise the multi-classing options are still in development, and I appreciate that this is at ALPHA stage, but I think you will need to provide an option to reconstruct toons that are part way through levelling.
I had copied 5 toons over the Lammania to see how things work.
One is a L10 human cleric, (1st TR after reaching L20 cleric). It was aiming for the L12 cleric PrE so that you can have the 'ready-brek' glow that heals everyone around you. The only thing I could see that was equivalent was something for late game (requiring 40APs to have already been spent in the tree (can't remember if it was healing or protection)). This was discouraging to start with, but I'm sure that will be sorted out.
I also copied over a Level23 Kensai 3/Arcane Archer 3. Kensai3 means that it L18 fighter - to get AA I went half-elf, wiz1, ranger1. This is no longer a viable character.
To get to slaying arrows (which are now a stupid clickie ability) requires 5 levels of ranger as a pre-req - most of the AA options require at least 2 lvls of ranger.
The fact that I'm L23 means that its not really a problem for this toon as I can TR and start over. If I was at L15 or so, the toon would be a complete wipe. You will need to have some form of 1 use character regen that allows current characters to just start again (i.e. from a L13 Ftr/L1 Wiz/L1 Rgr Kensai/AA which is non longer tenable, to resurrect it to a L15 AA or even to a L15 cleric if they want).
Also, from the point of view of someone like me who does not use short-cut keys at all, please cut down on the clickies needed - Passive feats and enhancements are so much more useful - or a single click and then that option is always ON until you click it OFF (WASD is of no use to me as I hit half the keyboard around them at the same time. My personal Dex score is so low that I have to use the arrow keys between the QWERTY and the NumPad)
PS: Ready-brek glow is a reference to an old porridge advert here in the UK. I can't remember the real name anymore, its what we call it in our guild.