IOS deployment with device expert and other question

Hello,

I am interesting to get device expert for my company. I have tried it on some cisco devices and it seems to be in accordance with what I wanted.

My question are:
1 - Is it possible to deploy a new IOS image to multiple devices, I think it is possible to script it but to you have an idea of the script. You should add it to default script.

2 - When you make a draft configuration and upload it to the device, change seems to be applied immediatly. Is it possible to upload the configuration to the device with a new name (ex : draft-v1.confg) in order to do a copy draft-v1.confg running-config afterwards ?

3 - I do not understand when to use tftp/snmp scripts or execute scripts ? What is the difference ?

4 - I find your software quite slow to connect to the device and execute some scripts. Is it normal ?

Thanks for your reply.
Regards,

Vince