1. The way you can add drum hits is to use the amount knob. It will try to add hits where it makes sense in a musical way. Further, you can copy or move the hits from one drum to another (if you, for example, want what the tom 3 is playing to be played on the floor tom) by using copy/cut/paste found on the right click menu on each drum.
If you want to add hits on an exact position you should (as you have done) record them, or drag the MIDI to your host and manually edit it.
2. EZdrummer 2’s windows is not resizable.
3. Keyboard shortcuts have been discussed a lot in the past, but the short answer is that hosts don’t let keyboard shortcuts to be used in plugins.
4. Lengthen MIDI blocks is only possible by copying them, not in the way Logic and Garageband does it.
When we design the programs we discuss these kinds of questions and solutions for months (and sometimes years), and trust me on this one – features that seems easy to just add to the product never are 
We are, however, constantly updating our products and we try to fulfill our customers needs so keep posting questions/ideas!
Cheers 
Henrik Ekblom - User Experience Designer
Toontrack
All downloads are found on http://www.toontrack.com. If you check My Account/My Products you find all available updates for your products. You’ll get there if you click the link in the “Check for updates” menu in EZkeys
Henrik Ekblom - User Experience Designer
Toontrack
1. The easiest way is to change the tempo with the “Tempo” knob, found on the lower left side in Tap 2 Find.
You can alos change the tempo of the entire EZdrummer 2 project as long as you don’t have “Follow host” enabled which means it will sync to the hosts time line and tempo.
2. You can’t set individual quantize resolutions for different instruments in Tap2Find.
You can however record a 1 or 2 bar block on the time line and then quantize different instrument parts separately (double click the block to enter Edit Play Style and then right click the drum you want to quantize). If you want to try out a lot of different quantize steps, you should create a copy for each variation of quantization that you need since it’s an applying effect, thus quantizing to 1/4 and then to 1/8 will have no effect.
When you are done, just drag the block to Tap2Find’s drop zone.
I hope this helps you
Henrik Ekblom - User Experience Designer
Toontrack
That is because the browser only contains MIDI, that is, the notes for what the loaded instrument should play. So if you load a piano in the main menu in the top, everything in the browser will play the piano. If you load our new product the Mellotoon, everything in the browser will play on that. The MIDI itself doesn’t contain any sound, only notes
Henrik Ekblom - User Experience Designer
Toontrack