I hope someone can help with these questions. 
I understand that applying online is generally faster than applying by regular mail.
Are there any downsides to applying online and if so, what are they?
Form 5257e:
Languages:
1b. Are you able to communicate in Eng. and/or French? (Eng, French, Both, Neither)
If the applicant is very weak in English and can't speak any French they should choose 'Neither' correct?
Assuming a visa is issued, how is this dealt with at the border upon arrival?
What procedures are used if the applicant can't answer any questions of the border agent?
1c. In which language are you most at ease?
Do you state 'neither'?
Details of visit:
Funds available: ?
If both cash and credit card will be taken, how much should be listed as funds available for the
trip?
As most know, one can have a fairly large credit limit on one's credit card, and thus the credit card
funds available could be much larger than what is required for the trip.
Do you state the maximum funds available on the credit card plus the cash?
Or something different, perhaps the funds likely to be used in cash + credit card?
Doc checklist:
-What constitutes "Proof of Financial Support"?
-"Purpose of Travel" what document should be provided for this?
In the 5257e form a simple question about this is asked.
But in the document checklist this new question is asked, and it seems a document
is being requested?

I understand that applying online is generally faster than applying by regular mail.
Are there any downsides to applying online and if so, what are they?
Form 5257e:
Languages:
1b. Are you able to communicate in Eng. and/or French? (Eng, French, Both, Neither)
If the applicant is very weak in English and can't speak any French they should choose 'Neither' correct?
Assuming a visa is issued, how is this dealt with at the border upon arrival?
What procedures are used if the applicant can't answer any questions of the border agent?
1c. In which language are you most at ease?
Do you state 'neither'?
Details of visit:
Funds available: ?
If both cash and credit card will be taken, how much should be listed as funds available for the
trip?
As most know, one can have a fairly large credit limit on one's credit card, and thus the credit card
funds available could be much larger than what is required for the trip.
Do you state the maximum funds available on the credit card plus the cash?
Or something different, perhaps the funds likely to be used in cash + credit card?
Doc checklist:
-What constitutes "Proof of Financial Support"?
-"Purpose of Travel" what document should be provided for this?
In the 5257e form a simple question about this is asked.
But in the document checklist this new question is asked, and it seems a document
is being requested?